Are you using a usb keyboard? if so try using a ps2 keyboard. It could be hanging on the floppy controller. Do you have the floppy plugged in correctly? If you do get into the bios then try disabling the floppy. If you see the post screen then almost always it will tell you what stopped the boot, but if you can't hit f1 to load the defaults then it won't boot.
Edit - I confused myself, I hope it makes sence to you. lol