CPU fan failure - CPU cooked?

January 10, 2012 at 12:59:00
Specs: Windows XP SP2, Intel Core 2 Duo 2.66GHz/ 2GB (but just purchased 4 more!)
On switching on my PC (self-built 4 years ago and worked flawlessly until the weekend), the various fans/lights etc start, but only for a second or so and then the power is switched off, only to switch back on again, and then off, etc... It never gets anywhere near booting anything.
Having checked connections, blown dust, removed video card, hard drive, etc I've discovered that the cpu fan does not spin and that the power will stay on with the CPU removed. Put the CPU back in and the problem re-appears.
Sounds like the fan has failed and allowed the cpu to cook. I noticed that the sealing compound has turned into a dry grey coating, like dried glue - that suggests excess heat perhaps?
The easy option of replacing the cpu fan isn't going to help, is it?
Any ideas, please?

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#1
January 10, 2012 at 15:18:51
Did you check the Power Supply ?? http://www.duxcw.com/faq/ps/ps4.htm

Did you re-apply the CPU/HS&F Thermal Compound ???


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#2
January 10, 2012 at 16:00:37
http://www.arcticsilver.com/methods...
The heat will cause a shut down to protect the CPU so you should be fine.
The problem is more likely the power supply or the hard drive.
Remove connectors from hard drive, remove all but one stick of memory, remove expansion cards, use onboard graphics if available and try to get into BIOS set up. If this works, add back hard drive. If that works add one thing back at a time and test. Use process of elimination.

You have to be a little bit crazy to keep you from going insane.


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#3
January 11, 2012 at 09:55:32
Thanks for the interest.

I must admit I haven't got to the stage of re-applying the thermal compound but I'm not sure how that would solve my short-term problem. The compound is non-conductive so it's not as if it will be helping complete a circuit or anything. Or am I missing something?

I haven't started checking the power supply yet as I wasn't quite sure how to go about it. Next on the list, I think...


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#4
January 11, 2012 at 10:06:24
Hi!

I think I've eliminated the hard drive and graphics card because I disconnected them, with no change to the problem. I haven't tried removing the modem and sound card or just leaving in one stick of memory - I'll try that next.

But you know when you have that sneaking feeling that whatever you try isn't going to work? That's where I was last night!

I shan't be able to make any progress until tomorrow so if you don't hear from me, I haven't just disappeared! And if anyone has any other suggestions I'd be happy to hear them...

Cheers


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#5
January 11, 2012 at 18:57:30
That is the way to do it, step by step but once you remove the heat sink from the CPU you need to clean off all of the old compound and reapply correctly of you might get it to start but loose it 5 seconds later to localized heat.

You have to be a little bit crazy to keep you from going insane.


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#6
January 20, 2012 at 10:38:19
Hi!
Sorry to disappear after a show of interest in helping me - I just haven't had the time to touch the PC. OK; I've found what will at least keep the main fans/lights etc running - disconnecting the ATX_12V_2X connector to the motherboard. The CPU heatsink fan doesn't run but I'm guessing it takes power from the ATX_12V_2X feed.
I've noticed that with the ATX connector plugged in, the PSU clicks quite noticeably just before the power is cut - like a relay or something.
I'm beginning to think that the general opinion is correct - I have a PSU problem. It sems a crude way to fault-find but I'm thinking of buying a new PSU and seeing if that cures the problem. If not - erm, back to the drawing board! I took a look at testing an ATX PSU but I'm not sure I'm brave enough to start shorting out connector pins, etc!
If I'm right at least my initial panic about cooking the CPU looks way off the mark...

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#7
January 21, 2012 at 05:17:39
Deleted....

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#8
January 21, 2012 at 09:09:04
Hi riider
I suppose I ought to thank you for answering my plea for help but I really did find your message condescending and a bit offensive. I'm not sure if you were trying to be rude or if you just have an unfortunate manner...
If I already knew what was wrong I wouldn't have asked for help, would I? And you overlook the fact that I'd opened the case because I already had a problem; you make it sound as if I'd caused the problem by breaking the heatsink seal!
Anyway, if you're still interested (or anyone else reading this) I've replaced the CPU fan AND heatsink (one of the nylon locking pins on the original one got damaged) but there's no difference at all. The PC fires momentarily and then stops. Disconnect the ATX_12V_2X lead from the mobo and everything keeps whirring and lighting...
I've checked every output from the PSU - all fine. My suspicion has now shifted to the mobo (Gigabyte GA-P35-DQ6); on another forum there are masses of people who seem to have had the same problem as me, concerning the ATX_12V_2X connection on their Gigabyte mobo. With little help from the manufacturer, by the sound of it... Most just got another mobo.
And no; my PSU is not a "generic piece of junk"; it's a Corsair HX620W.

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#9
January 21, 2012 at 12:09:00
Deleted.....

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