Does the popping sound seem to come from the bottom of the screen, near the middle, or just above the keyboard, in the middle? If so, the inverter board (which takes battery voltage and bumps it up to voltage high enough to run the display backlight) could be shorting out. If you connect an external monitor, and THAT keeps working, then my suggestion might be correct. The inverter board is not expensive, but the labor to replace it is.
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when its plugged in to power receptacle does the computer show any power led's?does it still turn on.
if it dosnt turn on anymore at all .without any more info i would guess your power supplie blew.if it powers on and no picture you may have bad videocard or motherboard.
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