I'm sure you already have checked this but it's worth a try. Did you check in the control panel area under the Power Options for how long it's set to time out the screen? Sometimes people don't know that they can change how long the screen will stay lit, then time out. In that same area you can set the time for timeout of the Hdd to sleep, closing the lid and what the power button actually does.
SOURCE: Dark Screen Inspiron 9100
If you replaced the inverter board and its still dark you need and new backlight itself http://cgi.ebay.com/LCD-Backlight-Lamp-for-Dell-Inspiron-9100-15-4-WXGA_W0QQitemZ150217509448QQcmdZViewItem
SOURCE: Acer Aspire 3100 Laptop Monitor will not turn on
Try Screen switch function to switch from Internal screen to External monitor to Both.
Normally FN + F4 (on Compaq or FN + F7 on Lenovo check the Function symbols on your Keyboard: allow few seconds after command to refresh configuration.
try Safe mode also. to check if display shows in VGA format.
SOURCE: Dell Inspiron 1501 LCD flashing colors,works fine on external
Have you updated the video driver?
If yes but problem persist I suspected it's your LCD screen is faulty and needs to be replace.
If your machine is under warrantly no need to pay any fee for the replacement of the part.
SOURCE: Dell Inspiron 9400 notebook display blank
Most likely, as you have said, this is already a hardware issue. For hardware issues the best thing to do is to have your system checked out by a local hardware technician. If your video is in fact the issue here then most likely you will be needing replacement for the motherboard now this costs a lot. so you have two choices really, 1) Just get a new laptop because the price of a new one will cost almost as much as replacing the part. 2) Have it fixed by Dell and have the part replaced then ask for warranty reinstatement, if they have one.
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