Question about Sony VAIO VGN-FW140E/W Laptop

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My grandaughter's Sony VGN-FW140E laptop will not boot up after being turned off unless it is unpluged from adapter, the battery removed, allowed to sit idle for 3 or 4 hours then put the battery back in without the power adapter and then turned on. It will then boot up o.k., but if it is turned off or allowed to go into sleep mode you have to repeat the steps above to get it to boot again. I am fairly computer savy but this has me stumped. Any help would be appreciated.

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1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced.
2. Make sure the power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work.
5. The power button could be bad.
6. The motherboard could be defective & needs to be replaced

Posted on Sep 18, 2010

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