When starting my computer it freezes on the first screen. I can access the BIOS but only if I press the button immeadiatly (not if it freezes) and even then it can take upto 3mins. Once in there if I make any changes the computer reboots and again freezes however if I make no chnages and exit it proceeds to check the boot sequence and will then load up Windows. As you can imagine this is very frustrating. Any ideas on what is causing this?