I was visiting a friend over the weekend and while I was there he decided to reinstall his PC.
He got everything reinstalled okay barring one problem.
On rebooting the PC, the display settings always seem to to revert back to 640x480.
We tried a clean install, using Driver Cleaner Pro and different versions of ATI drivers but after rebooting, the display setting goes back to 640x480.
The motherboard being used is an ASRock 939SLI-eSata2 and the GFX card is an ATI X550XT.