tried a working psu same watts 750watt still same fault computers turns on then straight back off, motherboard lights flash on and would indicates full cpu load.
same problem when i stripped compiter down to psu cpu board and then rebuild if bit by bit to test.
Sorry the Beeping was actually the screen on the front of the Case turning on, Motherboard does NOT make a sound.
Here is a list of my computer componants:
Gigabyte GA-P55-UD4 (Rev 1.0)
Intel Core I5 750 @ 2.67Ghz
Corsair XMS3 DDR3 1600Mhz 4GB (2x 2GB)
XFX ATI Radeon HD5770
Samsung Spindrive 320GB Sata Drive
Alpha Power ATX 750W
Thank you for replying