donut

I just built a new pc for a friend with all new parts. After I format the drive and partion, I can install an OS but it wont boot to the OS. I tried doing this several times reformating each time. I've tried win98, SUSE, and RedHat. It only boots to linux if you have the linux disc in the cdrom or I get this error: "DISK BOOT FAILURE; INSERT SYSTEM DISK AND PRESS ENTER" I have done alot of messing around with it and I cant seem to get it to work, does anyone have any ideas?