DVD burner causes freezing boot in SATA/PATA mixed system

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nubc
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#21 Post by nubc »

@ Bruce B
You're on page 2 of the thread. On page 1 I was working with an IDE optical drive, and it didn't work at all. I actually installed a PCI IDE controller card which ultimately produced the same non-booting issue. Curiously, this card almost worked when it was jumpered to be a RAID card, instead of a simple PCI IDE. Incidentally, Linux has a problem with RAID 0 configurations, as I recall. I concluded that the channel controllers on this motherboard are defective. That would probably mean a bad southbridge chip. There is really no reason to not hook up the optical drive to the available SATA terminal on the motherboard. I had hoped to reserve that terminal for an extra storage hard drive, but in light of the problems encountered, this was no longer the plan. The computer is known to be overheating because of the checkpoint stoppage: [Ithr] is the code for overheating of processor. Symptoms: failure to restart after successful initial boot, freezing keyboard, freezing mouse, failure to reboot after running for 15 minutes, successful cold booting after remaining off for 10 to 15 minutes. I am sad to report, the cooling system is inadequate in its current design. It needs a powerful fan running in leafblower mode. I can feel air moving through the fins, but this processor runs really hot. A good sized cooler with its own powerful fan is needed for a 3 GHz Pentium 4 uniprocessor. If I could mount a custom cooler on it I would, but the mounting is different for a socket 775 like this.

@ starhawk
Really, only one fan is needed, namely, a fan directly connected to an adequate heatsink on the processor. The combo fan can become the case fan. It's not a big case, by the way. I found a heatsink, but it's too wide. I guess I could spend an hour hacksawing a half inch off the width....maybe not. BTW, the original passive heatsink with the flimsy thin fins on top has a huge chunk of copper as its base.
Last edited by nubc on Wed 19 Dec 2012, 16:52, edited 3 times in total.

starhawk
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#22 Post by starhawk »

nubc, can you post a (good) photo of the inside of this computer?

Failing that...

Somewhere on that board is a Dell combined part and serial number. It should be on a sticker with a barcode, and it should read something like this:

Code: Select all

DS/N  MY-08P779-19341-24H-0EXE   : C/O MY
I need the second set of characters from that string, in this case "08P779". Alternately, there is another sticker with a barcode and a character string that should start with "AA", like this:

Code: Select all

AA  A67834-400
I'd need the whole character string from that.

Those identify which board you've got, at which point I can look up pictures and see what we're dealing with in terms of mounting. I may be able to give you a solution... it all depends on what quality of stuff Dell was smoking when they designed your board.

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nubc
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#23 Post by nubc »

motherboard
DS/N CN-0M3918-70821-4A4-00MS

heatsink
CN-0M5050-68282-48P-0056

combo fan mount
CN-0W5457-70821-4B2-D6ET

forum thread: modding 4700's cooling system, with pics (4 pages)
http://www.overclock.net/t/570434/moddi ... ternet-bro

forum post: fan is "backwards" on 4700
1. Dell(tm) Dimension(tm) 4700 Fan Orientation

Recently, several online forums and web logs (blogs) have reported that the system fan on the Dell(tm) Dimension(tm) 4700 was installed incorrectly (backwards) from the factory.

While it is true that the fans are installed "backwards" in the system, it is wrong to say this was done incorrectly or by mistake.

The Dimension 4700 system shipped with an aggressive system configuration that required more direct airflow than previously shipped Dimension systems. For this reason, Dell engineering modified the airflow in the Dimension 4700 to support a cooling solution designed with the fan pulling air into the chassis. The air is pulled in through the back of the chassis and is directed straight to the CPU heat sink and CPU voltage regulator before finally passing by the hard drive and out the front of the chassis.

It is correct to say the airflow is backward compared to other Dimension systems. However, without this difference in thermal design, the Dimension 4700 system would not perform nearly as well
forum thread: overheating issue Dimension 4700
http://forum.lowyat.net/topic/387944/all

Did I mention that I experienced all this overheating with the side panel completely removed? When the computer was freezing and refusing to boot, one side of the case was completely open. Point: this design is inadequate for cooling.

For more pics, just Google > Images for "Dell Dimension 4700 motherboard"
Last edited by nubc on Wed 19 Dec 2012, 18:09, edited 3 times in total.

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#24 Post by nubc »

If by design the combo fan is pulling outside air into the box and thereby pushing cool air through the heatsink, resulting in warm air accumulating inside the case, I need to somehow attach a fan to the heatsink and reverse the combo fan to exhaust the air out the back. The single removable side of the case has a large perforated area for pulling in outside air. The other possible air intake on the front is significantly blocked by cascaded hard drive mounts/cradles.The green hood might have to be removed, depending on the heatsink fan. There's a tight row of motherboard caps on the side of the heatsink to which I would like to attach the fan. Any suggestions on how to attach a fan to the heatsink, like with plastic zipties or wiring.

Another decision is the power source for the two fans. Currently the combo (case) fan is attached to the one single motherboard power source, so fan speed is regulated by BIOS. Given the circumstances (overheating), this fan should never slow down, should be always full speed (2900 rpm), not half speed (1300 rpm) when the system is idling. Thus it might be preferable to connect the combo (case) fan directly to power supply terminals. This would free up the mobo power terminal for the heatsink fan.
Last edited by nubc on Wed 19 Dec 2012, 18:05, edited 1 time in total.

starhawk
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#25 Post by starhawk »

nubc, I can see at least 3 different motherboards when I Google the provided string. Please give me the part number!

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nubc
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#26 Post by nubc »

motherboard
DS/N CN-0M3918-70821-4A4-00MS
Is that not the part number?

The first pic in this thread is my mobo, with the green hood up (out of frame)
http://www.overclock.net/t/570434/moddi ... ternet-bro
Last edited by nubc on Wed 19 Dec 2012, 18:02, edited 1 time in total.

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#27 Post by starhawk »

Very sorry, did not see that in your previous post :oops:

My apologies.

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#28 Post by starhawk »

nubc, do you have or can you get (cheaply) a standard socket 775 heatsink and fan assembly, with the backplate? It *may* be compatible... I'm not sure.

The fan sure won't be, though -- so make sure the fan size you have matches the one on the new heatsink. You can then simply swap them. I'm guessing your current fan is a 120mm, but standard sizes that it could also be are 80mm and 90mm.

BTW, the part number itself on those things is "0$####" where $ is a letter and # is a number ;) The rest is the serial number.

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#29 Post by nubc »

To the best of my knowledge I do not possess a socket 775 cooler or its assembly. There is a shop nearby, but the chances of getting ripped off are high.

Would you care to suggest a few standard socket LGA775 coolers? Especially ones that might fit the existing mobo assembly.

EDIT: Actually, I do have some socket LGA 775 coolers, but not the correct size. The coolers I have are more or less square, or rather, the way the cooler is attached forms a square. The base of Dimension 4700 heatsink is rectangular, so the assembly has four screws forming a rectangle about 50mm wide x 80mm long. Naturally, the long dimension faces the combo fan. I assume the unusual size is not negotiable on this rather small motherboard. It's difficult to search for a cooler this size, because 80mm happens to be a standard fan size.

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#30 Post by nubc »

I found a junk Dimension 4700 in my pile of stuff, and now I have downgraded the processor from 3.00 GHz to 2.80 GHz. Provided the CPU works (not tested yet), this substitution ought to be good for 20 or 25 degrees cooler operation.

I can reverse the combo (case) fan in its original mount, or just strap any old fan to the case in back. The combo (case) fan has an unusual connector to the motherboard. Basically this power connector looks like an internal analog audio connector, except the terminal has 5 pins instead of 4. There are no other fan power connections on the motherboard.

I have experimented with plastic zipties to secure a small fan to the side of the heatsink. If the fan is to evacuate air out the back, it must be connected to the side of the heatsink which has an obstructing row of caps on the motherboard. This row of caps, two of which are quite tall, severely limits the size of fan that can be attached to that side. A larger fan could be connected to the other side, but the air flow would be reversed, ie. air would be sucked into the case. That possibility doesn't really work because the larger fan would obstruct the green hood, which is responsible for air flow directionality. So now I am thinking about strapping an oversize fan to the top of heatsink, tossing the green hood, reversing the designed air flow direction by exhausting air out the back.
Last edited by nubc on Thu 20 Dec 2012, 03:39, edited 2 times in total.

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#31 Post by starhawk »

My hope was that the screw positions were standard and the rest was Dell dreaming up some funky stuff. Guess we're not nearly that lucky.

You will run into a problem subbing fans -- you gotta stick to the one you've got, or one very much like it. Dell has a habit (HP does this too, sometimes) of mucking with the wires, so that either the fan won't work, or the computer will think the fan has gone bad, if you do a substitution.

I've got a ton of heatsink/fan assemblies here -- a well meaning local tech shop owner gave me all the stuff he couldn't use (not realizing that it was largely useless overall) -- so I'll see if I've got anything that matches that mounting footprint you gave me. I'll also experiment and see how zip ties and such play out -- I've a few aluminum heatsinks that look very similar to what you're dealing with (is yours copper all through or just at the base?).

EDIT: last bit deleted because it doesn't matter. See next post by me (if it's not there, I'm still typing ;) ) for yet more questions and a bit of helpful info.

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#32 Post by starhawk »

Alright. Dug around in my parts bins... here's what I found.

I've a fan that *I think* matches your description -- it's a Datech (brand) DS9238-12HBPA. This is a 92mm fan (standard size). It's marked as "P/N P2780". Typing 0P2780 into eBay (a good way of checking Dell part numbers!) reveals that this is a common fan part number for several Dell systems.

Please check the photo below (clickable thumbnail) to make sure the connector and wire colors are identical. If they are, then it should work in your system, should you need a new fan.

Image

Dell pulled a fast one with their heatsinks -- the ones we're dealing with tend all to be the same size, and therefore physically interchangeable, BUT they're in Imperial measurements (inches rather than mm). All of mine (I've got a couple different styles) are 2.5"*3.5" (width*length).

This one should look like yours (clickable thumbnail) --

Image

For what it's worth, the heatsink in that picture is a Dell P/N 8P238.

Having the heatsinks all the same size is great -- it means that, assuming the fan is compatible (which it should be!), I can produce for you a heatsink and fan assembly that will work for you.

I will also include some thermal paste -- it's a good idea to replace the thermal material in between heatsink and processor (usually a gray or pink pad) with something engineered to work -- rather than engineered to be incredibly cheap while doing "just enough" (if that). Besides, over a long period of time (3+ years) the stuff can "bake" so that it becomes more of a thermal insulator.

You will, of course, have to get the old stuff off first, but that's not hard at all. Get "Arctic Silver Arcticlean" and follow the directions. It's bonehead simple. Get it here.

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#33 Post by nubc »

Just powered up. All systems are GO. Substituted CPU is running fine at 2.79 GHz. I reversed the combo fan to make it the case fan. (Transferring rubber mounts was tricky.) I top-mounted a 80mm fan on the CPU. There was a feature in the fins I could exploit, namely, two length-wise holes through all the fins, about a quarter inch above the heatsink copper base. I looped 12 gauge copper wire through the fin hole and up through two pairs of holes on the side of the fan; bent and twisted the ends together above the fan to tighten it down on the heatsink, then clipped the excess. Same for other side of fan and heatsink; balance between sides of the fan was important. No green hood now. The case fan is connected to the motherboard, as before, and the heatsink fan is connnected to a power supply terminal. The heatsink fan draws air up through the fins; the case fan pulls air out of the case in back. Like a typical two-fan arrangement. So much for the special Dell Dimension 4700 air flow design. I must say, this heatsink fan makes the cooler look like a Thermaltake custom job.

EDIT: Restarts work with no hangs (45 minutes after cold boot). Maybe I'll put the side back on, see how things go. I might have to take a picture of this mod. 8)
[I dunno if I can sell it now, if it's gonna behave.]
Last edited by nubc on Thu 20 Dec 2012, 04:01, edited 11 times in total.

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#34 Post by starhawk »

Good to know!

Check that connector photo anyways, if you want a spare fan AND it's the right connector, I'll gladly shoot it off to you; dell fans are useless to me.

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#35 Post by nubc »

Looks like I did myself a favor swapping the CPU out. Turns out this is a multiprocessor computer (ACPI Multiprocessor PC, as reported in Device Manager), and I installed a 2.8 GHz dual core processor. Everest reports it as an unknown processor. There are two entries in System Infomation, one is 2.79 GHz, the other 2.80 GHz. I did a memory-read benchmark with Everest and it scored 3915 MB/s, where I would expect 2800 MB/s at best for a 2.8 GHz uniprocessor. This is strong evidence that the processor is dual core. Should run cooler too, eh? [EDIT: The CPU is a Prescott P4 running in HT mode.] Santa came early this year. Just my luck the world ends tomorrow.

I intended to install Motherboard Monitor 5, but I wonder. If the BIOS has no temperature monitoring, like in System Health (non-existent), can I really expect to run a temperature monitoring program like MBM 5, SpeedFan, or CoreTemp? Opinions, recommendations, advice?

I ran the computer for 3 hours, watched a DVD movie without a snag. I'm not entirely satisfied with the temperature of the heatsink. It feels like 45 to 55 degrees Celsius, quite hot to the touch, but wouldn't sear flesh. Maybe shrouding would increase heat dissipation by improving air flow. The flimsy fins on the heatsink are the problem: they don't conduct enough heat, rather they just guide air flow. Unless another heatsink (80mm x 50mm base) is found, not much to do here.

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