Disconnect the batteries by unplugging both cables from the device. Leave the batteries disconnected for 10 - 15 min. Reassemble the device by following this Instructable in reverse order. After the device is reassembled if the screen does not work make sure that the cables are seated properly. The cables not being seated properly is the second most common failure in tablets.
If you Like this Instructable Please vote for me in the FIX IT Contest