I have an AMD Athalon64x2 3800+ on Gigabyte MA785G-UD3H motherboard and Win XP Home. The system worked OK yesterday and this AM will not power up even to the bios. It does present the Gigabyte page but does not allow me to chose bios, setup, boot menu, etc, seems to freeze just before this. There is one beep as it starts to power on then nothing. The monitor is on. I have unplugged all extra cables and even removed the wireless keyboard/mouse for wired versions. I have tried to load a floppy with Memtest - won't load. Tried the Gigabyte initial CD - no load. I believe that there may have been a MS update last night(there was for Win7) and I assume an auto reboot if there were updates. I use MS Security Suite as regular virus protection and often run Malwarebytes and have not seen any warnings or actions lately.
What can I do now????