Laptop boots but no display

Hello,
Acer Extensa, boots up but display doesn't work, black, it does however work on an external display. Already checked drivers and reinstalled them. I am running vista home premium 32 bit
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More about laptop boots display
  1. Sounds like a defective LCD or backlight. Is this system still under warranty?
  2. if you hold a light up to the display, can you see anything at all? if so, then it's the backlight (~$10). If there's absolutely nothing - just a single pitch black, then it could be as simple as the cable popped loose, it's a bad inverter (~$20), to a dead display (~$100). Here's a good troubleshooting site:
    http://www.laptopscreen.com/English/article/Quick+fix+tips+for+simple+screen+issues/
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