|"....there is no hard drive in it!.."|
When you have no hard drive, if the boot order list is correct, if there is nothing bootable detected by the bios in the boot order list, the bios will try everything listed in the boot order list until it gets to the network boot listing, then you will get the message you're getting.
All IDE laptop hard drives (2.5") have pins, not contacts, on their data / power header.
SATA hard drives have a socket or two sockets with contacts on either side of it (them) for their data/power connection
A laptop that uses an IDE hard drive often has an adapter you install over the pins so that it can connect to contacts or pins in the laptop's hard drive socket.
As I said above............
"You can find out all you need to know on the HP site about your laptop. They have downloads for it if you need them, and probably even have a Maintenance manual for the model series, as well as an Owner's or User's manual.
Search using the model number, or better still, the specific model number, or the part number - p/n - on the label on the bottom of the laptop - you don't need the # and whatever is after that when searching."
The info about installing a hard drive is in the Maintenance manual !!