Hmmm, that reminds me:
I have an EISA Compaq 486sx at a client site from which I had to remove
an add-on internal modem; ran the diagnostic/configuration program, it
says everything's fine, but when it boots it stops waiting for F1 saying
the configuration's incorrect. Press F1 to continue & everything works,
just a nuisance 'cause it can't restart after a power failure without
someone there to press F1.
Any ideas?
Check the cmos battery.