I have a 2008 Cyberpower PC. I've replaced the motherboard and it worked fine for awhile until a month ago. It started to randomly "die" during boot up into windows 7. Now I cant even get it to boot. I have tried launching windows repair, and the windows 7 installation CD, but it never gets through booting without the PC just randomly shutting off. Sometimes it will only power on for a few seconds before it shuts off. When this happens I cant get it to run until holding down the power button, but after holding down the power button, it beeps 3 times and nothing shows up on the monitor. The only thing i am able to do is enter BIOS, it has never shut off while in BIOS.
-Garrett
-Garrett