Man, I totally get this! I was the same way for years, scared to even open the BIOS menu. Then I wasted a whole afternoon replacing parts on a machine that just needed the boot order changed. It was set to try a network boot first and kept failing. Swapped that one setting and it posted like nothing was wrong. I felt so dumb for not checking sooner. Now it's my first move with weird boot issues, saves a lot of headache lol.