Computer boot problems
I am having a very strange problem. So I recently bought a USB 2.0 PCI expansion card for my computer and decided to install it tonight. When I went to turn my computer back on, it started to power on, but turned off after about 2 seconds and the power light blinked repeatedly until I unplugged the PC altogether for a minute or two. First I removed the USB card and tried to power on again with no luck and the same problem. So after trying a few more times, I decided to clean out the insides of the PC to get rid of some dust and such, still no luck. So then I took out my hard drive and put it in a spare PC as a slave drive, and the spare PC could see the hard drive and access the files on it.
So I took my main system and broke it down to bare bones - one chip of memory, keyboard, video card, and a spare hard drive I had laying around. PC booted fine like this. So I took my main hard drive out of the spare and swapped it back into the main PC as the only master drive, and it came back to the original problem - wouldn't boot. I unplugged the power from the drive, and the PC booted to the BIOS and POST was fine. Plug power back into the drive and wouldnt boot. Swapped IDE cables, put it on secondary, slave, cable select, none of which boots. As soon as my original hard drive is powered and connected, the PC wont boot.
Any help would be greatly appreciated.
In the problem PC, I have
-LEAD POWER 550 Watt ATX power supply
-ASUS A7V133 motherboard
-NVIDIA Geforce 4 MX 4000 Vid Card
-1 stick 256 MB SDRAM (after other two sticks were removed)
-Athlon 1.2 Ghz processor
-Western Digital WD1200 120 GB hard drive 5400 rpm