Why won't my computer wake up?

About 4 days ago my computer started to fall asleep (as usual) but when I tried to wake it up, It wouldn't.
So I tried to Restart my Mac and I immediately held down the Command-Option-O-F key combo until I saw a somewhat intimidating command-line display that ends with the Open Fimware prompt. I typed the following lines:
reset-nvram
pressed Return on keyboard
set-defaults
pressed Return
reset-all
pressed Return
It didn't work, so I deleted the com.apple.PowerManagement.plist file in the Finder/Hard drive/Library/Preferences/SystemConfiguration
It didn't work, I erased my hard-drive and reinstalled Mac OS X
It didn't work, I did a Hardware Test and my computer say everything passed.
NOW WHAT, IDEAS PLEASE.

Did you try resetting the SMU (whatever that stands for... I forget.)? I've got sleep issues with mine which seem to be solved by this.
Here's my scenario:
Computer goes to sleep via the apple menu. When I go to wake it up, the cooling fan spins up to maximum, but that's as far as it goes. Force-shut-down and restart, and it does the same thing. Reset the SMU, it spins back up normally. My solution thusfar has been to not put the thing to sleep.
Resetting the SMU proceedure:
1) turn off the computer.
2) unplug everything from the back, including the power cord.
3) wait 10 - 15 seconds
4) hold down the power button and plug the power cord back in.
5) release the power button.
6) press the power button to start the computer.
Don't know if this will help your issues or not, but it's worth a try. One thing I've discovered by reading the myriad solutions offered in these forums--they work on some machines, and not on others, with no rhyme or reason as to why. Yes, I'm glad I got the extended AppleCare warranty.
Later,
K

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