Bad mobo or CPU

carsick · 12-31-2007, 05:49 PM

About 3 months ago I put together a pc and everything was working fine, until recently. Last night the PC shut down, black screen and without warning. Since then I've tried different power supplies, power cords, plugging into different outlets, different hard drives, removed the video card (using onboard graphics) and rotated out both memory cards (1 gig each, 2 total).

My current symptoms are that as I try to boot up vista it just shuts down abruptly. Even the light on the network port shuts off. I then cannot turn it back on. The only way I seem to be able to get power back to the board so I can try to boot up again, is to unplug the main power cord from the motherboard and plug it back in. When I do that the light for the network port comes back on, I hit the power switch and the process starts over.

Other observations: Last week I upgraded to an Artic Cool 64 cpu fan and noticed last night that it wasn't running full speed. In fact it was turning on and off and thus creating hardly a breeze. The fins were quite hot. I pulled that off and replaced it with the original cooler. I didn't notice any overheating effects on the CPU, but don't know if heat damage would cause any visible damage.

I don’t have another cpu to test or another motherboard to swap in. Seems like a Motherboard to me, but concerned about the cpu as well for the above reason.

System:

MSI K9NBPM2-FID motherboard
2 gig 800mhz Gskill ram
AMD x2 5200 chip
Corsair 750 watt psu
Seagate 320 gb hard drive

Thoughts appreciated. Should I bring it in for testing or just buy a new motherboard (probably cheaper than a diagnosis) and cross my fingers?? TIA.

lally07 · 12-31-2007, 06:43 PM

what did you last do on your computer before it first shut down

carsick · 12-31-2007, 07:13 PM

Quote:

Originally Posted by lally07

what did you last do on your computer before it first shut down

Thx for the reply. Was looking at pictures from our vacation, using the canon software provided with the camera.

SirKenin · 12-31-2007, 08:58 PM

It definitely sounds like the CPU went up in smoke. I've had that happen to me before (an Intel Viiv system actually) and it turned out that the guy's HSF wasn't sitting on the CPU properly.

carsick · 12-31-2007, 09:31 PM

Quote:

Originally Posted by SirKenin

It definitely sounds like the CPU went up in smoke. I've had that happen to me before (an Intel Viiv system actually) and it turned out that the guy's HSF wasn't sitting on the CPU properly.

Thx for the reply. I was hoping someone wouldn't say that. Why does the motherboard completely shut down and refuse to come on after this? Seems like a motherboard problem, or is that typical when the cpu is bad?

carsick · 12-31-2007, 09:59 PM

I also just plugged the cpu fan into the system fan connector and it seems to work just fine. So doesn't the motherboard control the cpu fan? If it wasn't turning fast enough, wouldn't that also indicate a motherboard problem??

tia.

SirKenin · 01-01-2008, 06:33 AM

It refuses to come on because the CPU is malfunctioning. If you wait for it to cool off (it heats up in about 6 seconds) it will come on again until it overheats again.

12-31-2007, 05:49 PM	#1 (permalink)
carsick New Member Join Date: Dec 2004 Posts: 14	Bad mobo or CPU - How can I tell which one? Help please. About 3 months ago I put together a pc and everything was working fine, until recently. Last night the PC shut down, black screen and without warning. Since then I've tried different power supplies, power cords, plugging into different outlets, different hard drives, removed the video card (using onboard graphics) and rotated out both memory cards (1 gig each, 2 total). My current symptoms are that as I try to boot up vista it just shuts down abruptly. Even the light on the network port shuts off. I then cannot turn it back on. The only way I seem to be able to get power back to the board so I can try to boot up again, is to unplug the main power cord from the motherboard and plug it back in. When I do that the light for the network port comes back on, I hit the power switch and the process starts over. Other observations: Last week I upgraded to an Artic Cool 64 cpu fan and noticed last night that it wasn't running full speed. In fact it was turning on and off and thus creating hardly a breeze. The fins were quite hot. I pulled that off and replaced it with the original cooler. I didn't notice any overheating effects on the CPU, but don't know if heat damage would cause any visible damage. I don’t have another cpu to test or another motherboard to swap in. Seems like a Motherboard to me, but concerned about the cpu as well for the above reason. System: MSI K9NBPM2-FID motherboard 2 gig 800mhz Gskill ram AMD x2 5200 chip Corsair 750 watt psu Seagate 320 gb hard drive Thoughts appreciated. Should I bring it in for testing or just buy a new motherboard (probably cheaper than a diagnosis) and cross my fingers?? TIA.

12-31-2007, 06:43 PM	#2 (permalink)
lally07 Silver Member Join Date: Dec 2007 Location: Leicestershire, UK Age: 14 Posts: 119	what did you last do on your computer before it first shut down __________________ Motherboard:MSI K9AGM3 FIH socket AM2 AMD 690G Video Card: NVIDIA 8400Gs(I KNOW I NEED A NEWONE Processor: AMD Athlon X2 4000+ Dual Core Hard Drive: Seagate ST3250310AS 250GB PSU: Extra Value 550W Gold ATX RAM:A-data 1024mb 800Mhz + Kingston 1024mb 800M OS: Windows Vista Home Premium Edition Monitor: LG L7145 32" LCD TV TV Card: Wintv Nova-T 500 with remote Computer: BUILT BY MEEEEE

12-31-2007, 09:59 PM	#6 (permalink)
carsick New Member Join Date: Dec 2004 Posts: 14	Artic Cooler CPU Fan I also just plugged the cpu fan into the system fan connector and it seems to work just fine. So doesn't the motherboard control the cpu fan? If it wasn't turning fast enough, wouldn't that also indicate a motherboard problem?? tia.

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12-31-2007, 08:58 PM	#4 (permalink)
SirKenin banned Join Date: Aug 2006 Posts: 4,711	It definitely sounds like the CPU went up in smoke. I've had that happen to me before (an Intel Viiv system actually) and it turned out that the guy's HSF wasn't sitting on the CPU properly.

01-01-2008, 06:33 AM	#7 (permalink)
SirKenin banned Join Date: Aug 2006 Posts: 4,711	It refuses to come on because the CPU is malfunctioning. If you wait for it to cool off (it heats up in about 6 seconds) it will come on again until it overheats again.