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Look through the ventilation slits at the back of the TV with the room lights out. If you do not see white light light bleeding through the back, you have a back light failure. It could be the inverter circuit which lights up the CCFL ( cold cathode fluorescent lamp ). You will need professional help to replace it and could cost you about 70 to 100 $ to fix.
Sound like the firmware of the phone hangs up. Try to take out the battery and leave it for 1 min. Put battery back in after 1 min then turn on the unit. If same thing will happen then you need to restore the unit back to factory state. Please take note that this will delete everything to you unit.
1. Turn it off. pull the battery out and put it back again 2. Hold the Home key and Volume Down key buttons 3. Press and hold the Power key button until the device turns on 4. Follow the on-screen instructions to reset your device
There could be one or more problems with your notebook, a black screen could be a system board problem. Does the power light come on? If so turn unit off and unplug it, remove the battery and plug the power supply into the unit. Turn unit on. If the unit turns on it is a battery problem. If it doesn't power on then turn unit off and reinstall the battery and turn the unit, if you unit has a vga port on the side hook a monitor up to it and see if you get output. If you don't it is probably a system board problem.