The Q8200 is a 45nm Quad core, the 650i Chipset can't support a 45nm quad. Same problem I have. Go into the BIOS and clock your FSB down to 1130MHz. It it won't go to BIOS, once the computer is on, press the Reset button on the case and repeatedly hit the BIOS key. Keep trying this until it gets to BIOS.
Only the Nforce 7 series and above can support the YorkField Quads. (fully at least)
The boot time will be slower because it will have to manually readjust each time it boots, but that should at least make it boot.