Hi y'all - this doesn't make much sense to me, and it's fickle to search for, so I figured I'd ask in here instead.

I reinstalled a bunch of company computers today (after switching their old drives for new ones), and they will only boot completely into Windows if I leave the NIC as primary boot device, which makes PXE run for a bit and then move onto the Windows installation. If instead the drive is set as primary, BitLocker comes up and demands to be unlocked (which I can't do because that's another department and I couldn't be bothered to involve them).

Lots of other machines have been reinstalled in the same way, and BitLocker is not a problem there (the drive can be chosen as primary without issue).

Does this sound like a known problem of some sort to any of you? The machines are some years old, so maybe something ran out somehow? Only, they work fine via the PXE "detour", so it's not like they've been tossed off of the company network completely. They work completely fine - as long as they're not booted from the drive...

Any tips? :)