ssindahl wrote : Remove the CMOS
backup battery (about 1/2 inch in diameter by 1/16 inch thick) located behind the speaker assembly and to the left of the memory cards. You cannot see this battery until the bottom cover is removed. Instructions for disassembly are online at http://h10032.www1.hp.com/ctg/Manual/c00312740.pdf . You may think this sounds strange, but I am telling you a bad battery ...