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This is from Dell.
Error 2000-0334 indicates a problem with LCD panel, cable. As the video is fine on the external monitor, there is no problem with the video card or mother board.
To confirm the error message please run the LCD BIST on the laptop to check if there is any problem with the LCD screen.
To initiate LCD BIST:
Connect the AC adapter to your computer.
Hold the letter <D> on your keyboard and then turn on your computer.
You will see four colors (grey, red, green, and blue) on the screen in a sequence.
If you see any colors on the screen the LCD screen is fine.
Or if you find the giant fuzzy black vertical line or if the colors are seen only on have of the screen during the test, then the problem is with the LCD screen and LCD needs to be replaced.
First make sure that this is a LCD problem to do this connect your laptop to an external monitor, so that it is confirmed that your laptop itself is fine.
If connecting the laptop to an external monitor doesn't work it would mean there is something wrong in your system. Most common problem is dislodged RAM, remove your ram and reconnect it properly.
If your system is working fine on the external monitor then go near to your LCD screen when laptop is turned on and look very closely on the screen if you see the anything on it but very dim, it would mean that you have a faulty backlight, the backlight itself is faulty or the inverter.
For further assistance please feel free to contact me.
If you've connected an external monitor to your computer and the image is coming up fine then that means your video card on the motherboard is good.
The only other parts it could be is the LCD Flex cable that connects to the LCD screen to the motherboard, the LCD Inverter that powers the LCD screen or the LCD screen itself. Usually you can find a used screen that is complete with all those components on ebay.
Have you recently installed a new video card? If not then you need to because the one you have is broke. If you can plug in another screen to see if that works and if it does then you should re-install the software (if any) that came with the new screen. If you need anything else please let me know.
This could be caused for a number of reasons. First thing to determine is if the computer is bad or just the screen. Hook up a external monitor to the laptop and turn it on and use the FN key to turn on the external monitor port. If the computer is running fine with the external monitor then you have a bad LCD or LCD inverter. which is replacable but expensive.. you would want to look at getting a new laptop or using it with the external monitor.