A defective AC adapter does not charge the battery and prevents the computer from starting up on battery power only. To verify that battery power is available for the computer, connect the AC power adapter, allow the battery to charge for 30 minutes or more, disconnect the power adapter and press the Power button. Hi all, I have a HP DV 3505xx notebook that originally shipped with Vista. Last week I upgraded to Windows 7. I notice now that the battery doesn't appear to be charging and the message over the battery icon on the task bar is 'No battery is detected'.
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