Dell Latitude 3390 2-in-1 Will Not Power On

If your Dell Latitude 3390 2-in-1 does not respond when you press the power button, this issue may be related to a drained battery, a faulty charger, a damaged camera assembly, or an internal hardware failure. This guide will walk you through the most common causes, providing the best possible solutions to help you revamp and have your device working as good as new.

A drained or disconnected battery is one of the most common reasons for the Dell Latitude 3390 2-in-1 not to power on. Check if there are any LED lights coming from the laptop. If they are off, then the laptop might not be receiving power.

First, check if there is an issue with the power cord.
Look for exposed wires or burn marks on the cable. If the charger appears normal, try using a different outlet.
Plug the charger into a different outlet to ensure the outlet isn’t faulty.
After finding a functioning outlet, connect the OEM Dell charger to your device and wait at least 15-30 minutes before attempting to power on again.
If this does not work, replace the battery

If the LED indicator on the charger doesn’t light up, and the laptop remains unresponsive over time, the issue may lie between the charging port, battery, or motherboard.

Disconnect the charger and any peripheral (USB drives, accessories, etc.).
Hold the power button for 10-15 seconds, force shutdown.
Reconnect the charger and press the power button again.

If this reboot works, the laptop was stuck in a frozen state rather than powered off and shut down completely.

The IR camera assembly in the Latitude 3390 often malfunctions, preventing the device's system from fully powering off.

Check the top bezel (outer frame/border surrounding the display screen) for signs of damage or loose connections.
If the system only powers on after disconnecting/ disabling the camera in BIOS (a ROM chip located on the motherboard), the assembly may be defective.
Replacement may be necessary to restore it to its full performance level.

If your laptop powers on (fans are spinning and the power light appears on), but the screen remains black, the issue may be with the display assembly.

Shine a flashlight at the screen at an angle- if text or icons present faintly, the blacklight or display cable may have failed.
Connect your device to an external monitor using HDMI or USB-C. The touchscreen or display assembly likely needs replacement if the external display functions.

If the laptop was hot to the touch during your last use, you may have a heatsink issue.

Replace heatsink

This indicates a dead CMOS battery
Remove the back cover and locate the coin-cell CMOS battery
Replace with a compatible CR2032 battery

If the laptop still does not power on after testing the battery, charge, and camera assembly, the motherboard may be the issue.

Check the motherboard for any burn marks, corrosion, or loose components.
Make sure all power and data cables are properly connected.
Try removing the CMOS battery for 5–10 minutes, then reinstall it to reset the BIOS.
If the laptop still shows no power or light indicators, the motherboard may need to be replaced.