You could possibly put an AMD mobile athlon 64 4000 but you can not upgrade your video chipset it is soldered to your mainboard,you might find the athlon 64 4000 on ebay but make sure it is the mobile version or it might not work, hope this helps.this is the address to the service manual
http://h10025.www1.hp.com/ewfrf/wc/m...3185&lang=en&#