If it flickers on as in you see an image, it's not the inverter. If your image is there but you can only see it if you hold it up to a strong light, then it is an inverter issue.
Your internal video driver may be missing or corrupt. If you have driver issues, plug in the external monitor and go right to the Dell website, click Support, and have the system locate your service tag number. The service tag may also be on the bottom of your laptop unless the sticker fell off. You will need this to get the correct drivers. Once you get a list of drivers, look for the video driver.
If you need further help, reach me via phone at https://www.6ya.com/expert/paul_0c66f8a4b832f53f
SOURCE: DELL inspiron 6400 laptop screen turned black
this sounds like a classic case of inverter problems, it could be just inverter coil thats gone which is an inexpensive repair, if it is the inverter then its a bit more.
try the Fn the F key that shows two tv screen icons, it may just have switched to external mode by accident
good luck
SOURCE: D800 laptop will not display on external monitor
Most laptops go into standby mode when the lid is closed. To stop this, (Windows XP) click Start, Control Panel, Performance and Maintenance, Power Options, then click on the Advanced tab, select "Do nothing" in the drop-down for "When I close the lid of my portable computer"
SOURCE: The screen on my laptop stays a grey colour after
You could try reseating the video cable under the keyboard
http://support.dell.com/support/edocs/systems/latx1/en/sm/keyboard.htm#wp1111863
Could be a failed cable (Chafing in the hinge) or a bad LCD
System is old enough that if reseating doesn't resolve, might not be worth the cost to repair
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SOURCE: dell latitude D610. Screen goes black. External Monitor OK.
Make sure you have not accidentally used the FN+F5 key
That combination sets the laptop to use an external display.
If using that does not give you a display take a small torch (flashlight if in USA) and shine it at an angle on the laptop screen.
If you can see any sort of picture you would be looking at replacement of some minor parts to the laptop screen
Hope this gives you the information you need. If not add any extra information you may have and lets see if we can FixYa
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SOURCE: dell laptop screen goes blank when ac adapter plugged in
I believe I have found the problem with the 1525 that I am currently working on which has the same problem that you describe. Ultimately I think it's a problem with the inverter in the LCD. When the laptop is powered by battery the brightness is lower than full. When I plug in the power adapter the brightness goes to "full" and I hear a faint sizzle and the LCD's backlight goes off. Same as if you hold the Fn key and press the up arrow to brighten it, it will do the same thing when you reach near the full brightness. So for now I have fixed this problem by going in the Power Options and clicked on Adjust the display brightness on the left. Slide the slider to the left on the "plugged in" part and now when you plug it in it shouldn't make it go blank. I do want to note that I hear a faint buzz coming from the LCD when I plug it in. That must mean the inverter is faulty. WAY TO GO DELL!!!!!!
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