Took a minute to jump over to hp.com myself he has an Award BIOS.
Googled one long beep for Award Bios got this:
from here: http://www.neoseeker.com/Hardware/faqs/kb/12,12.html
The Award BIOS basically only reports either memory or video problems in its beep codes. Worse, the codes themselves sometimes refer to one OR the other item being the problem, or else it's the motherboard at fault.
Beep code brief:
1 Long Beep: Memory problem
1 long Beep: Memory problem
Something is wrong with the memory installed. Check out the troubleshooting memory problems FAQ for details. Note that there could also be something wrong with just accessing the memory (ie the motherboard has a problem).
Hope this helps.