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If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
1. You can check the display on external monitor>If the display is blank on external monitor also, its pretty clear that there is an issue with system board
2. If the Exernal monitor comes up fine, it will be an issue with the display of the laptop, you can cross check the issue by booting the computer to BIOS, IF you get same response on BIOS as well. Its an issue with the Display itself you can replace the display panel.
You have a VGA port on that machine that will allow you to connect a standard monitor. After you have connected the monitor you will need to tell the machine to switch the display. This is done by holding down the Fn key (3 keys to the left of the space bar) and pressing the key that looks like a monitor (typicaly the f4 key). Hit that combination a couple of times till your external monitor displays. This is also worth a try in case you have, accidentaly, set your notebook to only show on an external display. If that works, and everything else seems alright it means that you need either a power inverter or a CCFL lamp. Determining which will require patience and a power meter.
My best guess is that it's the screen or the screen sensor try playing with the angle of the screen. If it displays at a particular angle its the sensor if not its the screen, or motherboard. Either way if you pay Dell to fix it, it's like buying a new laptop.