gizzy said:
An 800MHz machine should definately allow you to flash the bios (if it can boot that far on a floppy). I would follow start with trying to flash the BIOS followed by removing the floppy and/or cd drive. If you can get into the bios you could also see if everything is set to there defaults, or change memory speeds to a lower setting. If it still fails, then I would reinstall the floppy with a boot disk and remove the hard drive. If all of the above fails, then you would probably have to get the mb replaced.
If 'anything' has changed on it recently (new mem, new HD, new CD drive, whatever), change it back, and work backwards from there.
Gizzy's offered the best solution(s) I think. The big clue you gave - that you try to get into the BIOS and all it says is 'Entering Setup', is the big tip. Sounds like your BIOS is hosed, or the MB itself has issues. Do you get any beeps? A Bad CD/HD or the like, wouldn't kill your getting into your BIOS, it'll just wait for a keystroke and beep at you. bad mem/wrong voltage mem, it either wouldn't boot at all, or would turn on and beep like mad. Still wouldn't interupt the entrance to the BIOS.
Seeing as how you can't get it to boot to the HD/OS, or even go into the BIOS, updating or flashing the BIOS isn't gonna work. (This is done in 2 methods usually - updating bios from within the bios, or a bootdisk with a flash bios). Being a laptop, that also means it's not going to have any jumpers or anything simple to 'reset' it under the hood, so to speak. (Something desktops used to have on older machines).
Best bet, is to 'try' to take it apart and locate the BIOS battery. Remove it/short it, this should kill your onboard clock and should default the BIOS to factory settings.
If that doesn't work - sounds like a dead laptop(bad motherboard) honestly. Replace the MB, or use it for a paperweight.