HP desktop trouble boot up

So the problem came up last night when i was sleeping, I woke up this morning and I couldn't get the moniter to exit standby mode. So I manually restarted the computer by holding the power button. When i tried starting the computer again, the power button which usually lights up blue did not light up, however the fans and everything else seemed to begin running and the moniter still said that it recieved no signal from the desktop. The LED lights from the motherboard are unlit and there was no beeping sounds at startup. 
ive been looking online for a fix, and so far Ive unplugged all the wires, pulled the ram out and put it back in, took out the motherboard battery and put it back in, took out the graphics card and put it back in, unplugged a majority of the wires connected to motherboard and put them back in.and still the problem remains. 
anyone have any suggestions on what to do next? could it be the PSU is broken or the motherboard?
The desktop has run very smoothly ever since i got it around this time last year. No issues with it until now. 
ive never used the site before so ill just follow the list:
1. Product name: 
The Desktop is a HP P6644y 
2. Operating System
Windows 7 64bit. 
3. No error message, becuz the computer seems to stall after turning on the fans, moniter shows no signal, and power button in the front is unlit. (Green power LED light in the back is lit up solid green however.)
4. The last thing i did before going to sleep last night was install Diablo III and play for about 2 hours. 

Could this document help?  It could be a power supply issue.
GeorgeFN
GeorgeFN
I work on behalf of HP.

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