Your motherboard appears to be made by Asus for a variety of OEMs including HP/Compaq.
The following info may or may not be of use to you. Some URLs have photos of your motherboard.
PTGD-LA/PTGD1-LA/PTGD2-LA Motherboard BIOS Update
http://h10025.www1.hp.com/ewfrf/wc/gene ... R1002_USEN
HP and Compaq Desktop PCs - Motherboard Specifications, PTGD1-LA (Grouper)
http://h10025.www1.hp.com/ewfrf/wc/gene ... R1002_USEN
Motherboard Description Motherboard: ASUS PTGD1-LA
CPU/Processor Socket LGA775
Supports Intel Pentium 4 processor up to 3.4 GHz
Supports Intel Pentium 4 HT processors
Front Side Bus (FSB) 800 MHz
Chipset Northbridge Intel i915G graphics controller hub (GMCH)
Southbridge Intel ICH6
http://h10025.www1.hp.com/ewfrf/wc/gene ... R1002_USEN
http://search.hp.com/redirect.html?type ... USEN&pos=4
http://search.hp.com/redirect.html?type ... USEN&pos=5