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Plug the tablet in, and try holding volume up + power buttons for 15 seconds or until something happens. If nothing happens, try holding volume down + power buttons for 15 seconds or until something happens.
If you tried to reset it and nothing happened, the battery may be dead. This happened to my daughter's Garmin GPS twice. I replaced the battery and bingo! I never understand why the unity needs a battery even when connecting it to the car's power cord...
If nothing happens when you press the power button then the computer is most likely out of power - plug a charger in and it should work. If it still doesn't you might want to get it checked at a service provider. If something happens when you press the power button but the computer doesn't turn on, then please provide more information, explaining exactly what happens so that I can help you.
try to get into the bios and see if the function of the power switch assigned differently. there are MB that use the a hotkey in the keyboard to power-up the system. It should be there in bios. Read the MB's manual too. On OFF state, try typing "O" and "N" then hit enter
Turn power off and unplug power from computer.
Unplug printers,backup drives and speakers.
Open case and unplug power supply from the board.
plug power cord back in press the power button.
Of course nothing will happen.
unplug power cord again.
plug power supply back into the board.
plug power cord backup and press power switch.
If nothing happens unplug power cord again.
pull out your memory sticks and plug cord back in and press power button.
Of course not much will happen.
But really something is happening to your computer so continue.
Pull power cord and replace memory sticks.
replace power cord and press power switch.
Continue this pulling out pci cards one at a time until you find out what the problem might be.
Try different keyboards and mice too.
power board issue or capacitors on the power board have blown this happens with electronics, service center will be required to replace the board or if you know some one who solders electronics they could do it also. to keep this from happening again buy a ups backup power supply which will condition the power to the tv and other components and save you allot of time and trouble later.
the lens cover gets stuck sometimes. It just needs a gentle touch and it opens up. Only happened once to me. In my case it happened after my daughter held onto the camera with her finger on the lens cover.