i reseated all the connectors and now intermittently (like once in 10 times after witching the back switch on and off) i get power to the GFX card and i think the CPU fan for less than a second then off again....
My last build did the same thing. I had neglected to plug the powersupply fan into the powersupply. There was a three pin wire that comes out the back of the power supply that needed to get plugged into the back of the power supply (kinda weird I know). After connecting this (this PS had modular cabling) it fired up fine. Good luck.
man i have the same problem with very similar build
OCZ Gold 512 ddr2 800
Just like you ive put this system together and when i fired it up it wouldnt turn on no power no beeps or anything at all ive RMA'd motherboard and powersupply just in case and they are suppose to be back tomorrow pls let me know if you find a solution its my first build too and im freaking out just as you are i will let you know if i can get it to work tomorrow