Take out the battery and disconnect the power supply. Let the laptop sit for a couple of minutes. Attach just the power supply and try to start the system. If this doesn't work, disconnect the power supply, let the system sit for a couple more minutes, insert the battery, and try again. If neither of these steps work, look for a reset switch somewhere on the machine. They usually are little pinholes on the bottom of the machine. If you find one, depress it for about ten seconds and try the above steps again.
Symptoms of a broken power jack
1. If you wiggle the power cord or the AC Adapter connector on the back of the laptop, the power LED and battery charge LED start to flicker.
2. Battery will not charge in the laptop.
3. Laptop runs fine off a charged battery.
4. With the AC Adapter connected the laptop appears to be dead.
No power LED or battery charge LED activity.
5. Laptop randomly powers off without any warning.
If your laptop is out of warranty, then you can fix the problem by re-soldering DC-IN jack on the system board. If it
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