I've already tried HP customer service. I installed 4GB of RAM & now the fan just keeps running & the screen is completely blank?!?! I took the new memory out & put the old 1GB stick back in (under the keyboard) yet I still have the same results. I plugged in a VGA cable to an extra monitor, no luck. I tried inserting the XP OS disc, nothing. Before I had a power on/BIOS password but I can't even get to the point where it comes up? Can anyone tell me how to reset the laptop as I hope my BIOS has changed with the new RAM & I don't have a more serious issue. The laptop came with Vista, but I downgraded to the XP disc that came as well. I'm pretty sure I have the right memory b/c I ordered it from crucial.com; its DDR2 PC2-6400 CL6. Please any help/info is greatly appreciated.