Why is my tablet screen black even after rebooting it?

I understand your pain, and I have been there too. It might be a problem with the tablet’s firmware. Flashing the firmware can sometimes resolve this issue:
1. You will need to download the correct firmware for your tablet model from the manufacturer’s official website.
2. Follow their specific instructions for entering recovery mode on your device.
3. Using the recovery mode menu, perform a ‘factory reset’ and also ‘reinstall the firmware’ using the steps mentioned by the manufacturer.
This process will erase all your data, so consider it only if you’ve backed up important files. Be cautious and ensure you’re using the official firmware to avoid bricking the device.

The issue you’re facing could be due to the screen itself being faulty. I know it sounds unfortunate, but sometimes the display hardware fails even if the rest of the device is operational:
1. If your tablet is under warranty, contact the manufacturer for a screen replacement.
2. Seek professional repair services if the warranty has expired. They can diagnose the screen or LCD panel and offer a solution.
3. As a temporary measure, you could try connecting your tablet to an external monitor via HDMI or another display port, if your tablet supports it, to use the device until it’s repaired.

It sounds like you might be dealing with a hardware issue. I had a similar experience with my tablet, and it turned out that the display connector had come loose inside the device. Here’s what you can do:
1. Carefully open up the back of your tablet using a proper toolkit.
2. Look for the flat cable connecting your screen to the motherboard.
3. Ensure that this cable is fully seated in its connector. Sometimes, a slight nudge brings it back into place.
4. Verify the cable for any visible signs of damage; if it looks damaged, you might need a replacement.
Keep in mind that opening your device might void any warranty, so proceed only if you’re comfortable with the risk.

Don’t panic; it could be a simple glitch that can be fixed with a bit of patience. Try the following steps that worked for me:
1. Fully charge your tablet overnight using the original charger. Sometimes insufficient power can cause the screen not to light up properly.
2. Try the power button and volume button reset after charging. Hold both buttons for about 30 seconds.
3. If possible, insert a SIM card or SD card into the tablet, then reboot it. Sometimes these peripherals can trigger the system to reset properly.
4. In some cases, discharging the tablet fully and then recharging might resolve stubborn black screen issues. Let the battery drain completely, then charge it back up.

I’ve encountered the same issue with my tablet, and it turned out to be a software problem. Here’s a detailed step you might try before assuming it’s a hardware issue:
1. Perform a hard reset by holding down the power button and the volume up button simultaneously for about 20 seconds. This might force your tablet to reboot differently than a normal power cycle.
2. If that doesn’t work, try entering safe mode. Power off the device completely, then hold down the power button until you see the manufacturer’s logo. Immediately release it and press the volume down button and hold it until the device finishes booting. Safe mode can often help in diagnosing whether it’s a third-party app causing the problem.
3. Once in safe mode, if the screen works, you’ll need to uninstall recently added apps that might be causing the conflict.