This is usually caused by an old or defective battery or possibly the power supply is a few volts too low to activate the charge indicator. It might be charging but not letting you know. Try to run it off battery for a while (look at the battery life) and then plug it back to for a while then unplug it again to see if the battery life if higher than before. To check the power supply you will need a volt meter that can read at least 20 vdc (most power supplies are 19 vdc). Put one lead of the meter on the inside of the plug that goes into the computer and the other pin on the outer silver part while the power supply is plugged into the wall outlet. You should read close to what the Output Voltage on the power supply says which should be on the sticker on the back or side of the black box part of the power supply.
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This is usually caused by an old or defective battery or possibly the power supply is a few volts too low to activate the charge indicator. It might be charging but not letting you know.
Try to run it off battery for a while (look at the battery life) and then plug it back to for a while then unplug it again to see if the battery life if higher than before.
To check the power supply you will need a volt meter that can read at least 20 vdc (most power supplies are 19 vdc). Put one lead of the meter on the inside of the plug that goes into the computer and the other pin on the outer silver part while the power supply is plugged into the wall outlet. You should read close to what the Output Voltage on the power supply says which should be on the sticker on the back or side of the black box part of the power supply.