[andrewas]

Its odd that it would reset the sequence without the user doing anything, though. And odder that it would change to a sequence beginning with the network card, home users are virtually never equpped to boot from the network so the BIOS wouldnt be rigged to default to it.

Which leads me to suspect that the hard drive has died. The machine tries to boot from HDD, fails, and then goes on in the sequence till it hits the network, which also fails.