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I may have addressed this question earlier. If your Dell shows absolutely no sign of life... no LEDs, no nothing and you know for certain the battery and/or power adapter is good then...
If you have access to a docking station (ANY Dell dock that will mate with the bottom connector on your D800), put the D800 in the dock and use the power button on the docking station.
If the laptop powers up, you may have a simply problem with the laptop "Press to turn on" button.
ABOVE THE LAPTOP KEYBOARD...
Use a small flat screwdriver blade to remove the Center Control Cover (just beneath the display/cover hinge and above the F1-F12 keys). Locate the cover's flat ribbon cable connector above the Page Up key. Pull off and carefully reinstall. Try the power button now. If it works, put everything back together. Otherwise seek profession help.
Check the status of the battery directly from the battery. Turn the laptop over and on the batter is an battery indicator button and lights to tell you if it's charged. If it is charged then you have an problem internally. Wiggle the tip of the power cord at the laptop connection to see if it is loose, if it is then you have an loose connection on the motherboard which can be fixed by an experienced tech that can solder or the motherboard will need to be replaced.
IF THIS HELPS PLEASE VOTE.....GOOD LUCK AND THANKS..
The problem may be the modem has to assign an IP address to your laptop, what you may have to do is plug the laptop into the modem and see if the laptop recognizes the modem with no errors in device manager,
Next turn off the laptop and modem, reboot the laptop then modem for the modem to assign an IP address.
ok now it sounds to me the power pack on the back has shat its self so ufourtanetly u need a new one if u still have a valid warrenty ring dell or go to their web site at www.dell.com and they will happiley help u there number is also their but if u dont have warrenty go to their website and see how much it costs for a new battery but see a friend who has a dell laptop and plug in the power cord it might be your power cord not your com or battery so give it a wirl and if u have any problems email me at firstname.lastname@example.org
is it asking for bios password? if so get in touch with DELL if youre a second user of unit it will be harder for dell to supply you with pass unless you have details of original owner e.t.c there is a third party solution BUT I dont know if I can say here..put it this way ..where theres $$$ theres a way :)