This started in the last couple weeks - If the computer is off - when I attempt to turn it on - it powers up but nothing happens - lights flash on the cd drives and I can hear the hard drives spin up. Monitor stays in standby - no POST beeps are heard. I've found if I make some kind of hardware change it will boot most of the time. IE - today I moved the ram from bank1 to bank2. The other day I disconnected the USB hub. Another time I disconnected an empty hard drive tray. I've tried leaving it on for a while (30 min) in the pre-post state and nothing happens. Its fine if its just rebooted. once the computer is running - it works flawlessly - i've just been leaving it on for the most part these days so I don't have to deal with it but I would like to find a resolution. My config. XP Pro no SP1 512 DDR RAM Athlon 1900+ ECS-K7S5A MB CDrom CDRW 20 GB HD 120 GB HD GForce4 440 64MB PCI - EIDE Controller card 300W PS - i know its low but I've been running this config for months without problem. I have found very few people with this problem - however this is one of them. http://www.techspot.com/vb/showthread/t-8224.html and here is another http://forums.devshed.com/t97793/s6c20f93e15bcce6c220ec9d59e393da0.html and there hasn't been a resolution posted. Any thoughts would be appreciated. Thanks. I'm out of ideas about what could be the problem - maybe a bios virus?