Help!! Defrag hang; now win98 boot problems

My machine was working a fine but a little slow so started a defrag. Hang
after 82% completion. No response to Alt-Ctrl-Del at all. Reset machine -
now when I start the machine, it beeps continously (like a siren). The
monitor says "check signal" and then turns off. I pressed "Ctrl" but the
beeping does not stop and there is nothing on the monitor. I put in the

floppy disk in the drive and reset again. There is no attempt to read the
drive. I can only turn off the machine to turn off the beeping.

I have been trying all day to get it to boot.

I would appreciate any help here as I am completely lost !!

Thanks!!

ryan