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First - re-seat the hard disk and reboot the computer. If the computer does not boot up then reboot and go into the BIOS configuration to see if the BIOS detects the hard drive. If it doesn't detect the hard drive then it could be faulty. Then the hard drive needs to be replaced in the computer/laptop, Windows installed and the computer or laptop's device drivers plus your programs etc. to get a functioning computer/laptop again.
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
Give more descriptions--does it display the DOS boot up screen (IT guys call it POST-power on self test)? This is the black screen that displays some information about the computer's hardware, and may give you F key options or DEL for setup, etc. Does it beep? Try using a VGA cable and connect it to an external monitor? Remove the RAM and try booting and see what it does? or Reseat the RAM chips located under the laptop.
Check to see if you have the machine switched out to a stand alone monitor. This is a feature on many lap tops that lets you re-direct the signal out to a larger monitor, or if your monitor fails you can display the computer info on another screen. This feature is engaged by holding down the Fn key and tapping teither the F4, or F6 key on many lap tops. This feature can be toggled by both displaying at the same time or switched to the stand alone or the Lap top.
The other cause is that the machine has malfunctioned usually because of the CPU failure and there is nothing to boot the machine up.
Keep pressed the power button of your laptop for about 30 seconds, the machine will power down.
--The above step may not be required as already so many days passed by.
Then plug it into the power adapter.
Switch the laptop on.
Boot in "safe mode" (F8 during boot).
This will fix any driver or some operating system issue during previous failed boot process.
Once it boots completely, do a normal shutdown and reboot your laptop in standard mode (no more F8 this time).
Now your laptop will be ready to use.
Boot the machine into safe mode. Right click on My Computer (XP) Computer (Vista) and select manage from the sub menu. When the window pops up select Device Manager. A device list will populate. When it has look down the list for Display Adapters. Click on the + icon next to Display Adapters to it expands. Right click on the display adapter and select uninstall.
Restart the computer and let it boot in normal mode. If it boots in normal mode let it detect the Display and install the drivers for it. I would be a good idea to update the display drivers via the Dell support website.
If it still won't display in normal mode please post back.
hi are you sure it displays nothing or is the display dark ? try shining a light at the screen see if you can see anything. if you can see something on the screen then it is quite probably yout lcd inverter, this is a part that is responsible for lighting up the screen.
if nothing on the screen try pluging a monitor into the the laptop if it displays to an external monitor try switching between monitor and lcd this is usally Fn + F4 or F5 you should see a screen icon on the correct key. if you still get no display then my best guess would be the screen is at fault.