it depends a bit on what he/you mean by not booting. if he could access the bios earlier and now he can't that might mean it's something relatively serious. he could check the manual to see if he can get access to the cmos battery, or if there's some other way of resetting the bios.
he could also try making a win98 boot floppy. then doing fdisk /mbr, that is it passes the power on self test
that'll delete the master boot record, which might do the trick
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