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CPU failure?

Last response: in CPUs
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May 6, 2010 6:19:42 AM

Recently my pc locked up. Video, sound, HD, and fans all quit but the power led stayed on. The power button would not do anything. I used the switch on the PSU to turn it off. When I looked at the CPU heatsink I found the fins clogged with dust. The bios was set to power on after a power failure. About 2 seconds after I flipped the power on the fans would jerk once and the power led blinked once. It wouldn't respond to pressing the power button. I was able to clear the cmos. Now the first time I hit the power button after cycling the power switch the fans jerk and the light blinks once each. With a diffrent PSU the fans don't jerk but the power led still blinks once. I have disconnected everything except the CPU 1 stick of ram (I have tried 2 diffrent sticks) and keyboard. There was no change. I have also tried removing all ram with no change. With the CPU removed but its heatsink still connected the sound the fans make is changed slightly.

Does this sound like a dead cpu?

I am posting from my ps3 so I can't type very fast since I don't have a usb keyboard.

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a b à CPUs
May 6, 2010 7:03:09 AM

Might also be a dead mobo, but it's really hard to tell.

It could also be bad ram, as I have had problems booting with a previous pc wherein part of the ram has gone bad. (The screen just is black, no beeps, no nothing). I did change the ram and it suddenly did boot.
May 6, 2010 7:17:35 AM

If you don't get the POST screen when you turn on the PC than it is most likely dead MoBo.
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a b à CPUs
May 6, 2010 10:46:59 AM

FunSurfer said:
If you don't get the POST screen when you turn on the PC than it is most likely dead MoBo.


It depends, could be:
- Bad psu
- Bad memory
- Loose video card
- Bad video card
- Speaker not connected, so you wouldn't hear the error
May 6, 2010 12:38:31 PM

amnotanoobie said:
It depends, could be:
- Bad psu
- Bad memory
- Loose video card
- Bad video card
- Speaker not connected, so you wouldn't hear the error


The OP switched PSU and RAM.
Bad GPU won't make ALL fans stop.
May 6, 2010 4:48:24 PM

Thanks for the replies. I am going to try a new MB first since that is cheaper and easier to return. It was the clogged heatsink and the fact that I was able to clear the cmos that made me think it could be the cpu.
Anonymous
a b à CPUs
May 7, 2010 1:17:48 AM

turns out you can get an account from a ps3 but not log back in.

Well the MoBo was dead but it was a symptom not the problem. The new MoBo worked for about 15 min before it died. Windows blue screened every time before the log in screen. Looks like I need to start from scratch. Though I can probably reuse the hard drives safely.
a c 172 à CPUs
May 7, 2010 12:11:48 PM

Before you start blindly changing parts, do some troubleshooting first.

Post your specs.

Our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...

Tear everything done, cleanall the parts, and start from the beginning.

I suggest breadboarding. Build the system outside of the case.

Light on the motherboard only indicates that the standby power supply inside the PSU is working. Fans running indicates that you have 12 volts present. Fans not running means you don't.

Breadboard with just PSU (remember, main and CPU power plugs), motherboard, CPU & HSF, and the system speaker. You can turn on the system by momentarily shorting the two pins that the power switch header fits on.

You should hear long continuous beeps indicating a serious memory problem. (There's none installed remember?) If you get silence, one of the three components is bad.

Add a stick of RAM. (Oh, be sure that you power down between testing steps.) Boot. Pattern should change to the one long-two short beeps indicating that the memory is passing the basic BIOS memory test. Test each stick separately, then all together.

If all this passes, install the video card (remember the PCIe power plugs). You do not need to connect the monitor yet. Now you should hear the single short beep of a successful POST. Now you can connect the monitor. You will see a "Missing keyboard" message. Connect the keyboard and you will see a "No boot drive found" message.

Silence indicates that the video card is shorted or overloading the PSU and that the PSU is electronically shutting itself down (one of the benefits of using a high quality PSU such as Seasonic :) ).

Long and short beeps indicate a problem with the video interface on either the motherboard or video card. Test the video card in the other PCIe slot. If it works there, your motherboard is bad.

If it doesn't work there, you have two choices. You can either test your card in a working system or plug a known good card into yours. Both alternatives present a small risk. There's a very small possibility that a bad GPU could destroy a good motherboard or a bad motherboard could destroy a good GPU.

!