This morning I replaced 2 of my case fans as they were getting old and noisy. I booted the pc and It would not boot after stating the processor present. I tried mutiple times cleaned my cpufan etc and tried again. Still failed. After removing everything I booted fine and it turns out my pc wont boot into bios or past the processor information if my external hardisk is turned on.
This hardisk is just used for backup/storage so there is not boot info on it. It worked fine before I changed the fans.
Once the pc is in windows I can turn the external disk on and it works fine. But the pc wont boot with it on.