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this is BIOS asking.
there is no windows running at all, just cold booted
there are web sites that have the cure , for cash paid
google finds them. easy
hit enter 3 times see if you get a PW hint, code
that see means there is back door PW reset, (paid)
Okay this is common with that old laptop the problem is usually the lcd inverter i attach a tutorial video for you to see and understand what it is.
this part produces the high voltage required to light up the screen and burn out it is under the actual screen below the plastic bezel which is held to gether by screws under little plastic covers locate at top left right and lower left right of the screen Dell Latitude E6400 LCD Inverter Replacement How To Tutorial
You should start up your computer from WinPE, a CD residen simplified Windows operating system. It might help you to make some diagnostics. Get it from http://www.uploadable.ch/file/mKD6atNTMRGF
It's only 121 Mb; burn ISO to CD and boot it . Probably you should change startup sequence on BIOS to boot from CD-ROM
Computer does not boot up The problem maybe the RAM, it is faulty or just needs reseating to make proper electrical contact. Reseat the RAM and then boot up your laptop. If it still does not boot up then remove the RAM module/s and take them to your friendly computer repair shop and get them to test the RAM for you. Just like you sometimes need a mechanic to repair your car, sometimes you do need a technician to diagnose and identify the fault or faults on your computer. Not only does a good service technican have the experience to deal with this type of problem, they also have the equipment that allows them to look at things the average computer user can't see, and he has a collection of replacement parts that can be used to quickly test individual components on your computer.
one quick simple test to see if the key works is hold the Fn key and press the power button on a clod boot from power off state. If the PSA diagnostics start the Fn button is functional, and we'll need to troubleshoot other issues.
If the PSA diagnostics do not start, then reseat the keyboard (It has a slot connector into the palmrest) and see if that resolves. If still no change, replace 1st the keyboard, and if that doesn't resolve the palmrest.
Try to boot from the Resource CD by selecting the <F12> key and select boot from CD/DVD drive. If you tried to run the "Diagnostics" option from the <F12> boot menu and it went to command prompt, there might be an issue with your hard drive or the "Diagnostics" partition is corrupted or missing. If all tests pass using the Resource CD, then your OS is probably hosed. As for the 9 LED light, that just indicates that your numeric keypad is enabled.