New Computer wont post (solved)

Hello, I just built my first from scratch computer.
Everything was working on it fine, got it up and running installed W7.

The Issue:
I was transferring my steam file to my new hdd since it was much faster than my old one (~140GB for steam file)
I was also installing DOW2 on my PC.
I went out for supper with my PC running to finish this all off and came back 5 hours later.
The PC was off which I thought weird.
I tried turning it on but nothing popped up on my monitors.
I thought I fried my CPU by installing the cooler poorly (CPU LED was on) so I turned it off unplugged it, cleaned the thermal compound and reapplied and reinstalled the cooler.
Plugged it back in and this time the power button did nothing, no beep no power, nothing.

Now I'm not certain whats wrong, did I kill my HDD?... any advice would be much appreciated, thank you.


Case: Antec 902
Mobo: Asus P7P55D-E Pro
CPU: i5 750
GPU: Crossfire 5850
HDD: 1 TB WD Cavalier Black and 500GB WD
PSU: Cool master GX 750W
CPU Cooler: Scythe Yasya 1000
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  1. Thanks to anyone who spent the time reading my problem.
    I removed the CMOS battery for a moment then rebooted it and all seems fine now.
    Hazaah! no wasted $2,000 :)
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