FreeBSD stalls at F1 prompt

This seems to be happening to HP servers. When that happens, do these

1. Boot up your box with the FreeBSD install CD1
2. When you get to the boot selection menu, choose 6 (boot loader prompt or sth)
3. That drops you to an OK prompt
4. type unload
5. type set currdev=disk1s1a
6. type boot -s
7. type boot0cfg -opacket da0