events; friend has an emachine t-2798 toshiba 60gb hd. Mobo crashed. Ok,replaced with biostar p4m80-m4 mobo.Hooked it up,all gd. Set bios to defaults.have cd-rom to boot 1st. insert repair disc for emachine(since that is whats on hdd. Still wont boot after message reads xp re-installed .My ? is ,do I need to reformat hdd and start all over? I think I do, but I'd rather not..help