As with all laptop computers, your Dell Latitude D400 computer might not boot up for a variety of reasons. The only way to actually determine the exact reason and get your computer up and running again is to perform a little trial-and-error troubleshooting. This troubleshooting can be done with tools that you already have, unless the problem proves to be more serious than previously expected.
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Charge your battery. If your Dell Latitude's battery has lost all of its charge, you won't be able to run your laptop off of battery power. Insert the battery into your computer and then plug the battery's charging cable into a wall outlet. The battery will charge (the amount of time this will take will depend on the size of the battery) and you will be able to run it off of battery power again.
Run your Dell Latitude off of wall power. If you don't have time to wait for your battery to charge but have a wall outlet available, plug the charger cable into the laptop and the wall outlet. Your Dell Latitude will run normally, allowing you to use the device while the battery charges simultaneously.
Discharge the power from your motherboard and attempt to boot your computer again. Remove the battery and the charging cable and hold down the "Power" button for 30 to 60 seconds. Put the (fully charged) battery back in and press "Power." With the extra power from your motherboard discharged, your computer will boot. This will not act as a permanent fix to the problem, but it will get your computer to start again so that you can use it temporarily.
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