I purchase 3 1GB sticks of DDR 400 Memory. I also added a new Seagate 250GB Sata Harddrive. I upgraded from Windows 2000 to Windows XP. Everything went smoothly, and I enjoyed my reinvigorated computer for about two weeks. Then, as I was working one day, the computer froze. When I rebooted, the motherboard would not post. The monitor does not even recognize that the computer has been turned on; it still says 'no signal'. I thought maybe one of the sticks of memory had failed, but I replaced them with the older sticks of memory, and there was no change. I started unplugging on piece of hardware at a time and rebooting to see if I could find a faulty part, but nothing worked. The only parts I did not try were the processor (under a large heatsink) and the video card.
The computer makes no warning beeps when I try to boot. Also, there are speakers attached and I get no recorded messages of problem with the motherboard. I am at a loss as to what is causing this problem or how to run more tests. The path of least resistance if the mobo is dead is to just pay between $40 and $70 to replace the mobo and ride this computer until I have a real job in about two years. But, if there is possibly a much simpler answer, I would like to avoid wasting any money doing something unnecessary.
Thank you in advance for any help you might be able to offer.