Hello, I have some questions about your issue:
Does the noise come from the speakers?
Have you tested with a different power supply? What is the wattage or model?
It may also help to recover/update the BIOS. Desktop Boards; BIOS update instructions
Please check the release notes before updating if using version older than 2161.
Please get real. It worked one day, the next it didn't. Why would the PSU make a difference? Or the BIOS overnight? Yes I tested & substituted the speakers. I installed a sound card & the speakers worked. Ergo it's the board. To date I've jumped through too many hoops, too many BIOS updates, take it out of the case, stand on your head & other time consuming rigmarole. It was shagged. I got an RMA for it. Pity the replacement has gone up in smoke on the first power up.