My Dell Inpiron 6400 has just died.

good day,
hope this link below will solve your problem.

pc & laptops

Check that the computer is not hibernating rather than shutting down. It will be in the power settings.

well if it's a new battery and you're having issues send it back, you may need to calibrate your new battery with the laptop

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

when you say screen will not turn on it means we do not have display right? now, try this. turn off laptop, press and hold D key then press power button, check if the LCD will display colors if yes then it might be your video card causes the problem which needs motherboard replacement. if no colors appear then LCD needs replacement.

if the processor fan is off or removed processor heat and its work for 1 or 2 second thats why change the fan and then try again

Please open Bios by pressing F2. If in Power settings it shows the ac type unknown ur system board needs replacement. If it is showing ac type none then the ac adapter needs to be replaced

sounds like a power scheme setting is shutting off your monitor after a time-out period. sometimes monitor will not return without re-boot. change your power options settings in control panel.

Hi,
1. Shut down the system, remove the battery and the Ac adapter from the computer.
2. Press the power on button for 10 seconds
3. Reinsert the battery
4. Power on the computer and as soon as you see the dell logo press the f2 key a couple of time
5. Using the up down arrow keys , go to the option that says battery info. If there is an error message listed kindly post it back

6. Otherwise shut down the computer reconnect the ac.adapter and check if the problem is solved

Also the battery has a diagnostic lights on it , remove the battery from the computer and press the button on the battery a set of lights would glow. If they are steady and come in a series the battery is good , If some lights are missing the battery is bad and may need replacement

Thanks
Proton

Could you please run the diagonistics on the computer?
Turn on the computer. When the DELL logo appears, press <F12> immediately. Select Diagnostics from the boot menu and press <Enter>.
NOTE: If you wait too long and the operating system logo appears, continue to wait until you see the
Microsoft Windows desktop. Then shut down your computer and try again.
b Press and hold the <Fn> key while powering the system on.

Make a note of any errors that you get after running the diagnositcs on the computer.

It could possibly be a bad motherboard. But before having the mobo replaced, I suggest you swap out parts from a working system to eliminate points of failure. if you don't have the parts, just remove the parts not needed for posting. this includes the hdd, optical drive, modem, bluetooth card, wireless card, and external devices. once you see the dell logo, install these devices one at a time and see what causes the problem. If you decided to have the mobo replaced, you can send your system to the depot for repairs. before this try pushing F12 when booting see if you can get onto the dell diagnostics.