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Help me diagnose

W

wxiao

Junior Member
My self-assembled PC suddenly stopped booting lately. I have been using it for about two years. Initially, it would stop booting half of the time, then it just stopped working.

The motherboard is an ASUS M4A78-EM AM3/AM2+/AM2 780G HDMI Micro ATX board.

I did the following:

1. Unplugged everything except the PSU, and tried to boot - not working. I think I narrowed it down to PSU, motherboard, or CPU.
2. Cleared CMOS. Changed battery. No use.
3. Use paper pin to test PSU. Its light went on, and it powered up a hard disk that was still connected to it (but not to the motherboard). It looks like the PSU is fine.
4. I took the CPU and installed it on another AMD machine I happen to have. The machine powered on. So it was not the CPU that caused the PC to not boot.

My conclusion is that the motherboard is bad. What do you think? Did I miss something important? Many thanks!
 
When you say you unplugged everything, do you mean everything (USB headers, audio panel connectors, etc)?

Any beeps?

You might want to check whether it is still within warranty, ASUS retail boards have a three-year warranty (at least they do in the UK).
 
mikeymikec said:
When you say you unplugged everything, do you mean everything (USB headers, audio panel connectors, etc)?

Any beeps?

You might want to check whether it is still within warranty, ASUS retail boards have a three-year warranty (at least they do in the UK).
Click to expand...

Yes I did unplug everything. Aha, I didn't think about the warranty issue. Thanks for reminding me.
 
If you have multiple DIMMs, then try with each DIMM separately (or test them in another computer). If they check out, I agree that it is most likely the motherboard.
 
adding to mfenn's response - a system without graphics/cpu/ram should give beep codes for each of those situations. If it doesn't beep at all (assuming that you have a speaker connected correctly) or consistently for those situations, it could be a board problem.
 
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