It's asking for a boot disk because it's probably set to ONLY boot from floppy. You need to alter that in the BIOS. The manual should be able to give directions on how to alter the boot sequence so it will boot from Hard drive.

However, in the link I've provided I noticed there are a few updates for the Intel D865 Perl. I'm not sure if this is yours or not. If not, you might want to double check your version to see if there are any updates.