Problems with asus P6T (regular one)

Hello everyone

I was building my new core i7 system last night ,I installed the cpu in the mobo with 3 sticks of ram in the orange slots, a video card and then I plugged the 24 pin and 8 pin connectors and the 2 pci express power connectors for the video card, right after I tried to turn on the system, but the motherboard would not POST and I noticed that there were no beeping sounds from the speaker. These are the things I tried after that:

-->Reseat wires and power connections, nothing different happend......

-->Tried to boot with just one memory slot ( the first orange one from left to right), and had no change

-->Unnistall and reinstall graphics card in another pci-express slot, and no change again.


I believe that i just have a bad mobo , but i wanted to know if there is something else i can try before RMA

This is the system:

-->Intel core i7 920
-->Asus P6t MOBO (regular one)
-->3 Gigs of Corsair 1.5 volts DDR3 memory
-->Evga Geforce GTX 275 896 DDR3
-->Corsair 750 watts PSU (Non modular)

Any help would be appreciated...............................

Actually I don't think the problem would be the PSU because I installed it in another computer and it was fine, the computer booted up and entered into windows normally.

About the memory maybe you are right, nevertheless I just tried to turn on the system once again but this time with no memory installed expecting a beeping sound regarding "no memory found", but again no beeping sound whatsoever.

I gonna try to unnistall and reinstall everything (even the cpu) to see if that helps......