A question first...When you attempt to boot the computer does it "beep"?

This could be a bad BIOS flash...It could be a RAM problem...could be from overclocking and maybe the motherboard died..My recommendation would be to start by removing your current RAM sticks and replace with one stick of "known" good RAM. Just for good measure, I'd replace the CMOS battery. Then use a Windows 98 boot floppy to load to a DOS prompt onto the Win98 partition..FAT32 I assume?...and then reflash the BIOS IF it will allow you to load it that way. You'll need to have the BIOS driver files on a floppy and the flash utility also. In addition, you'll need to use a standard PS2 keyboard, not a USB version.

Hope this helps.

Grif