"So if i go back to 2Gb system, install Vista Ultimate 64. Then insert the other 2 sims ur saying the board will miraculously see this other 2Gb? When it wont post the bios currently with all 4 sims inplace."
Just to be clear here, I pointed out that, in the links I could find;
1 - Asus NEVER claimed that mobo would support Vista of any flavour
2 - Asus NEVER claimed that mobo would support 8 Gb Ram in anything but 4 servers and XP PRO 64 bit.
Further, you wanted to know how to get into Bios and I said remove 2 sticks of Ram.