I recently had the popular problem of Windows 7 battery manager malfunctioning and not charging my battery when plugged in. The battery was fine, the power supply was fine, and the motherboard was fine (I have enough laptops with the same specs in the Headspring office, and I was able to swap out parts to isolate the problem). I also searched for this problem online, and many folks are having this problem with all makes of laptop computers. I found the steps that solved my problem here on the TechNet forums . There are multiple solutions proposed, and here are the steps that fixed it for me: Plugged in, not charging Windows 7 solution : Jeffrey Palermo (.com)
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Plugged in, Not Charging Is the most recent BIOS installed? Boot into the BIOS. Under power management check the battery. Is it reported OK?