Hi recieved new psu today and i still have exactly the same problem. I also tried this with the new psu, which i got off gigabyte technical support
1) Remove the M/B from the case.
2) Only install the basic components on the motherboard – CPU, CPU cooling fan, one memory module, VGA card (if there is no VGA onboard) and power supply.
3) Reset the CMOS once - Disconnect the power cord from the power supply & detach the CMOS battery for 5 minutes then put it back.
4) Connect the internal speaker.
5) Turn on the power to see your system can power up. (Connect only the power switch from the case to the M/B)
Looks like I will have to RMA the motherboard back to ebuyer. Cant fault ebuyer with their rma on psu, picked up tuesday, and delivered today and no hassle whatsoever
cheers for replies