Try the following resolution:
1. Boot the computer to windows recovery mode.
2. Click Command Prompt, type in:
rename c:\windows\system32\drivers\classpnp.sys classpnp.old
if your windows is on your d:e: or x: drive use that, your original classpnp.sys file will be rewritten when windows boots.
I suggest a startup repair. If that doesn't work, perhaps a system restore will.
If neither of those work, we can start diagnosing a hardware problem.
Sometimes when that happens you need to clear the cmos to bring the machine back to life. It's worked for me quite a few times. Although there is probably an underlying cause like hardware or it may not happen again for a long time.
Download a copy of Memtest86 and burn the ISO to a CD using Iso Recorder or another ISO burning program. Boot from the CD, and leave it running for at least 5 or 6 passes.
See this link also: HD Diagnostic
Ok I'm not sure if I have them in the right slot, I have 4 slots 2 black and the other 2 are blue. Ok I'm gonna say slot 1 is closes to the cpu and slot 4 is farthest away. Ok I have a 2GB in slot 1 and it is blue 2-empty and color is black. 3- empty color blue. 4- empty color black. so it's blue black blue black and only 1 slot is full at the moment. Do I put the RAM in the slot 1 closest to the CPU? Or slot 4 farthest from CPU?
For exemple, if 2 sticks are in the blue, you can switch them both over the black sockets. As long as both sticks are in the same-color socket, it's OK.
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This is the 2nd stick of RAM in the same week I've had go bad. And I only have 2 sticks of RAM, and one of them I bought 2 weeks ago.