Motherboard wont post.

Hello,
I recently built a computer for my Dad with a ASUS m4a78lt-M mobo. It worked fine for a few hours last night before we shut it down, we tried to start it up this morning and the motherboard wont post (or beep). Basically all we see is a black screen.

I've taken the RAM out and it hasnt beeped and Ive also took the heat sink off of the CPU and touched it and it was hot as suggested in some threads I saw.

I built an exact copy of his rig about 2 months ago with all the same parts except the PSU and DVD drive, everything else is the same.

My Dads setup:
2.8GHZ AMD Phenom II x4 CPU
ASUS m4a78lt-M mobo
4GB Gskill DDR3 1333 Ram (1 stick)
Saphire ATI Radeon HD5770 1gb GPU
Western Digital 500GB HD @7200 RPM
Rosewill Cruiser Case
Rosewill Green Series RG530-S12 PSU
LG DVD Burner
(everything bought through newegg.com)
My setup has all the above except the DVD drive and PSU (I have a sunbeam) and everything works great.

Just wanted to know if the mobo is dead or if there was anything else i could try to pinpoint whats wrong and get it to boot.

Thanks for Helping  

edit- Forgot to mention all the internal fans turn on but the Power LED's and HD LED on the front will not light up at all also.