How do you check if MoBo/CPU have failed?

August 31, 2010 at 19:37:48
Specs: Windows 7, Duo Core/2GB
How do you check if MoBo/CPU have failed?

Each individualy or both please.


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#1
September 1, 2010 at 01:30:57
if cpu have failed u wont be able to startup ur pc u would hear beeps the fans wont spin u would have blue screens overheating
if the board fails ur pc will not turn on the mobo light will not turn on its dead wont start

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#2
September 1, 2010 at 03:45:06
There is no definitive way of checking either, it is more of an educated guess based on what it is not rather than what it is.

It is very rare for a CPU that was previously working to fail, almost unknown, so that is the thing you think off when you have exhausted all other possibilities.

Motherboards can fail but there ore other things that can fail that makes it look as if the motherboard is the problem. You have to eliminate those first. In order of possibilities, a faulty power supply, hard disk and memory can render a computer non-operative. Have you checked these and eliminated them as a problem,

What are the symptoms you are experiencing?

Stuart


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#3
September 1, 2010 at 12:44:21
I have disconnected everything, I am using PSU, RAM and graphics card that is all. When I push the power button all the case lights, fans power on, the light on the graphics card and it's fan come on, the processor fan kicks on spins up than stops and repeats, the monitor light turns orange, but absolutely nothing comes up on the screen just blank. It is just a big light box right now.

I removed the RAM and pushed the power button and no sound. I removed the graphics card and the same. Now I cant say I remember if the system speaker works though either so..


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#4
September 1, 2010 at 13:47:15
The orange light on the monitor is just an indication that it is not receiving anything from the graphics card in the computer.

The fact that the lights come on and the fan spins does not necessarily mean the the power supply is working properly. The fans spinning is a good clue that the power supply may not be supplying enough power to get everything working. I would first try with a know good power supply.

But first, take out the ram and give the contacts a rub with a pencil eraser. Deposits can sometimes build up on the contacts. Reinsert the RAM making sure it is seated correctly and try again again.

You can leave any hard disk, DVD/CD drives disconnected as you should still complete a POST without them connected.

Once you have eliminated the power supply and the memory then it is probably the motherboard but test with a known good power supply before you condemn the motherboard.

Stuart


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#5
September 1, 2010 at 15:36:58
Ok cleaned the RAM and a No Go there. I checked the rails on the PSU with a digital multimeter and they all read great. Let me know if that is enough to say it isnt dead I dig into my nightmare of a PC parts bin for a working PSU with a 24 pin mobo plug. Thanks for the help.

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#6
September 1, 2010 at 16:21:18
A multimeter by itself is not a definitive check. The best that a multimeter can do is that it might be OK. The multimeter doesn't draw enough power to see how the PSU performs under load which might be totally different.

If you can check each individual rail while connected to the motherboard and attempting to boot that would give you a better idea, It is the 3.3v, 5v, and 12 v rails that are the important ones.

Stuart


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