m/b not booting

Hi,
I have just finished upgrading my pc and wheniturned it on the onlysystems working are the fansand the on board switches fa "Power" switch which allows you to turn it on seperately from the m/b rather than the cases front panel a long with a "Reset" switch which acts the same also a "Cmos" switch for clearing the cmos, all these light up when the power is turned on apart from the fans and the switchesnothing else is happening,no post codes and the system will not turn off unless it is turned off using the PSU switch
The Board is a GA-MA790FXT-UD5P DDR3
CPU AMD Phenom 11 Black Edition X3 720
Ram Kinston Value Ram 4Gig DDr3
Graphics Galaxy 285 GTX
HDD Western Digital Cavier Black 640 Gig


Can anyone give me some Idea as to what the Problem might be, I have a feeling it could be the cpu has failed.
TIA mortda