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I have a Compaq Evo N620c laptop that we bought from someone who refurbishes computers, so it was used. I knew it needed a new charger so I got that, and it worked fine. Then I took it out of town, plugged it in as soon as I got there and was able to use it. It then sat unplugged for a few days. After flying home, I can't get it to power up whatsoever when plugged in. I unlock the battery part and kind of mess with the battery, repositioning it, and it makes a whirring noise like it will start and then ultimately doesn't. Does that sound like the battery? I thought you didn't need the battery to use a laptop?

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You don't need the battery. Provided the power adapter, and the power adapter port are both good, you can use the laptop without a battery. Can you find out what issues it had before it was refurbished? –  Bon Gart Jul 1 '12 at 23:54
    
Something might have gotten knocked loose on the flight back, especially if your laptop was in checked luggage. –  jjlin Jul 2 '12 at 0:04
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