I built my own computer from scratch last January of 2012. It worked great up until now. My motherboard is Biostar A880G+ and CPU is AMD Atholan II (Rana). From day one of building my computer, the onboard audio output had problems that there was no sound but loud hissing noise. I believe, the output port had problem. I was able to reroute sound through my video card HDMI output. So, I didn’t care. It was fine all this time until last few weeks. Something died in the computer and I am trying to figure out what died. I have tried all the tricks and tips posted online and still I can’t figure out if my motherboard or CPU that died.
This is what is happening. Whenever I click on the power button on and keep it pushed down, the computer starts up – case fans start running, cpu fan starts running, system power light is on. However, just as quickly as they came on, the system kills itself or turns off in 1 to 2 seconds – everything stops working – with me STILL pushing the system power button down. When I let go of the power switch from ON position, the system does exactly the same as explained above – everything comes on and quickly shuts off again. OH, BY THE WAY THERE IS NO BEEPS SOUNDS OF ANY KIND. I have on board beeping speaker. As far as I can remember it always beeped at boot time. Now, it doesn’t.
Plus, I also noticed that the longer I don’t turn on the system, the longer it stays on. So, I simply didn’t do anything with the system for about a week. Then, I decided to see if I can fix the problem. When I turned on the system, it stayed on little longer and I thought it fixed itself, but within 5 seconds it quickly turned off itself.
As many have suggested online, I have removed any audio card, video card, RAM, connection to the hardrive, connection to the CD/DVD ROM. The only thing that was connected to my power supply was motherboard and CPU. When I turned the system on, it did exactly the same as described above and NO BEEPS at all. So, I am now down to either CPU or the Motherboard. What do you think?