Second build, plugged it all together but when i power it up the cpu fan works for about 1-2 second before stopping and then a continuous short beep starts. Before anyone asks the 20+4 power connector and the other 8 pin power connector is in. I've tried without anything other than the cpu/memory plugged in and without the memory/1 stick and it still does the same.
Standoffs are in as well.
Intel Core i5 3470
Corsair 8GB (2X4GB) DDR3 1600Mhz Vengeance Blue
G7 Power Extreme 780W
Figured it out. Was just cpu fan and cpu was fine. Was dodgey memory, all sorted now. Thanks for your help.