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I recently opened my HP Pavilion G7 laptop in hopes of cleaning the cooling fan.  I removed the hard drive, RAM, wireless internet card, and battery.  I then could not remove the keyboard so I stopped and put everything back together.  Ever since I did that the laptop won't turn on at all.  I don't get an error message.  The light on the power button does not even light up.  Based on a post I saw here, I tried removing the hard drive, RAM, and battery again, and plugged the laptop into the wall.  Still nothing.  It seems like either I have a major problem or something related to the power button is not functioning.  Any ideas?

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