I've seen a lot of posts about Dell laptops suddenly losing battery power. But I've not found a post with my particular question. Several weeks ago, when running on battery only, my computer started going into hibernate mode without any warning. The battery icon in the system tray would show the battery to be almost fully charged, but after about 30 minutes, the hibernate would occur. I usually use it with A/C power. Last night, when I removed the power cord, the computer suddenly lost all power, as if there were no battery installed. When I look at the battery meter (Fn+F3), It shows 96% charged, and the "battery health" tab says my battery is performing normally. Additionally, when I remove the battery and push the little battery icon on it, all 6 LEDs light up, indicating that there are no dead cells. If I push and hold the button for 3 seconds, no LEDs light up, which supposedly means the battery is healthy. I appreciate any suggestions. I'm running Windows XP, SP2, and using a wireless network.