Also you have 2x video cards in there just try one. I allways keep a old pci video card for troubleshooting issues like this.

The two beeps from your galaxy psu [I use one] that some kind of safety warning. these psus have had issues running certain video cards. for instance I had a problem with a 3870 x2 and that psu, I returned the psu and enermax sent me a newer revision version that has had no issues.

If you can try a different psu. but I do think T-flight could be right, depends when you got the board, mine had 0705 bios installed as default I think.

I dont think your board is dead izzy, just keep trying different things, ram voltage may be an issue but I would have thought 'det ram' would show on the lcd and hang maybe.
not sure but your psu might be the issue [incompatible] with something possibly.