I was dusting out my PC and the only way to get the dust out of my GPU was to take it out. I pulled it out of it's socket and when I finished put it back in and started my PC. Apparently this reset my Bios because when I started my PC it took me to the Bioa and everything was at default.
Am I just going to have to manually set up my Bios to the way it was before?
My Phenom 2 x4 was OCed from 3.2 to 3.8 so am I going to have to OC it again? And if this was a stable OC before am I going to have to stress test again or can I just use my previous settings?
And if my previous settings produced a stable overclock, can I just set them to what they were before and be done? Or do I still have to stress test again?
Removing the GPU usually doesn't reset the settings. If your computer is over 3 years old the button battery which powers the real time clock and SRAM that stores firmware settings on older PC BIOS motherboards (newer UEFI motherboards store them in non-volatile flash so pulling the battery will just muck up the clock) may be dying.
Some motherboards with buggy firmware may detect a firmware mismatch and force the settings to reset for stability purposes.
Losing system settings is an unfortunate fact of life for overclockers and enthusiasts. I'd rather they be reset occasionally than refuse to reset when something goes wrong. If you're not used to it by now you should be soon