PC didn't wake up; now won't start

[Cuckoorex]

Before I went to sleep last night, I put my PC to sleep as I usually do; when I woke up and moved my mouse to wake up the comp, nada. Monitor stayed off, no lights on keyboard. Lights on the case were on, and the fan started up. I checked all connections, tried turning everything off and on, unplugged and replugged everything; same result. Turning on the computer starts the fan and case lights, but no signs of life from keyboard or monitor. HALP

[Markxxx]

error

[Hari_Seldon]

When my computer did that, the hard drive was dead.

[xash]

Try some of the suggestions in this thread:

My computer won't start!

@xash

It appears to be a hardware problem, most likely a dead motherboard or CPU.

Try this:

Disconnect and emove HDD.
Disconnect and remove all RAM sticks.
Power on the computer.
If it gives you a series of beeps, then the motherboard is OK and it might be the RAM that’s causing the problem.
If you hear no beeps, then the motherboard/CPU is most probably dead.

If you hear beeps, try booting with one stick, then the other (if you have multiple sticks of RAM)