PC boot issue

[hans gruber]

Every so often my PC fails to boot. On investigating it appears the boot device priority in the BIOS gets changed. I switch it back and everything is fine until it eventually happens again.

The problem is I sometimes use remote desktop and turn my PC on remotely. If it happens then I’m not there to fix the issue.

Does anyone know why this may be happening and how to fix it?

 

[hans gruber]

I replaced the battery a couple of months ago and thought this issue had gone away, until this morning. I will try some of the other suggestions. Because it happens so infrequently it's going to be hard to diagnose, so I guess I'll just try everything else.

 

[hans gruber]

Thanks again all. Just to update I had to change a case fan. While mucking about this error happened again. As the case was fully open I just swapped the cable from the drive the PC was trying to boot from to my Windows drive. So far it seems to be working. It doesn't matter now if it forgets drive boot sequence as Windows drive is on position 1.

Am not sure why I didn't think to do this before.