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More than likely the screen. The inverter normally causes things on the
desktop to be barely visible. The whole screen looks black, but with a
flashlight you can see the images are there when the inverter is bad.
Look at the LCD screen very closely and check if you can see a faint image on the screen. It's possible that the LCD lid close switch stuck in the "closed" position and the back-light stays off even when you open the LCD screen or turn on the laptop. The switch turns off the back-light when you close the LCD display to save the laptop battery power.
If no luck, try to remove battery and drain the power, then replace battery and turn on.
If that didn't fix it then there are 3 things that could have gone wrong:
1. Video cable connection from inverter to LCD got loose. To check this, follow instructions from step 3 on how to open the LCD and check if cable is fitted properly.
2. The video inverter is faulty The screen inverter failure is very similar to the back-light lamp failure. In both cases the screen gets very dark and the image on the screen becomes very faint, barely visible under a bright light. If it's still under warranty, take it for a replacement. You can replace this otherwise - you can find the inverter under the screen, follow the procedure described at point 3 to open up the screen.
3. The LCD monitor is faulty If it works on an external monitor most likely the LCD is faulty and needs replacement. If it's still under warranty, take it for a replacement. If not, you can do it yourself, it's pretty easy. Remove the rubber covers on the side of the screen, unscrew the screws take the plastic cover off, disconnect the video inverter and put in the new LCD after you connect the video inverter to it.
Can you see any image on the screen in a dark room, using a flashlight sometimes helps. An image will be most visible right after you turn the laptop on, when the logo appears. If you can see the image but it is dark you need a new probably backlight inverter which is a relatively easy and cheap repair - I usually charge less than $50.
Ok, from the beginning. Can you do a cold boot and get into the bios? (is there an image on the screen then)
Secondly, can you connect to an external monitor and see an image?
Did it do this only when it was heading in to hibernation? If so, it sounds like the power management needs some adjustment.
If there's no image on the external monitor, you may have a video/motherboard problem, or it still could be the operating system/power management.
It all depends on if you have video in bios.
Let me know.