Quote:
Originally Posted by Drunk Skunk
I was in the process of unplugging my PCI card and a modem card that was still in there for some reason when I noticed something unplugged. I'm a computer moron, but it was plugged in before and it's not plugged in now - there's no plug on the PS to connect to whatever this thing is. It sits right above the two hard drives, and it's a white 4 pin connector, the same that is on my video card. I figure that before taking everything out, maybe I should find out of this whateveritis is important, and if it could be causing the issue. Here's a picture ... feel free to laugh at my computer ignorance 
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That's just the power connector for your floppy disk, don't worry about it
You might want to hook it up though because sometimes you might want to boot from the floppy drive for certain programs/tests if your computer is in trouble but we shouldn't worry about that right now because at least your computer appears to be POSTing. (Power On Self Test - all the words that appear at the beginning) and then locking up.
Pretty good that you managed to swap power supplies by yourself, it might not be lining up because the case is an older standard - but more than likely, you might have it in upside down?
If you can at least boot to that screen, then its looking better. Like others said, resetting the CMOS might help. If you can't find the jumper to do this, you can turn off the PSU with the powerswitch on the back and then pull out the CMOS battery (the big round silver button battery) from the motherboard for an hour or so. There is no need to disconnect any wires or anything. If you want, you could pull the power cord from the powersupply. Also, it's usually DELETE that gets you into the bios and not F1, F2, F10, etc.