Replace the Discrete Video card. That's why your LCD didn't detect when you run the Diagnostic test. There 2 type of video cards available to Dell Inspiron 6400/E1505. Either you have a on-board video card or discrete video card. Mostly, the discrete video card is caused when you not getting video output to your LCD (completely dark as if it is off). Discrete video card is detachable and replaceable. Good Luck.
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yep tats correct,,u can try the above steps and if it still doesnt work,,then try to connect it to an external monitor,,and check
Can you hear the hard drive spinning?
Can you see a dim image when you look at the screen at a sharp angle?
Are you getting just a blank screen when you turn on the laptop? Are the lights coming on? If so, try reseating your memory one stick at a time in each slot one at a time.
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