If your Nothing Phone 2a is completely black and won't respond, the first thing to try is a force restart. Just press and hold the Power button for a solid 10 to 15 seconds. You should feel it vibrate and see the Nothing logo appear on the screen. This simple reboot clears out any temporary software glitches that might be freezing the phone.
Check Your Charger and Cable
Your phone might just be completely out of battery. Plug it into a wall outlet using your original USB-C cable and a compatible charger. The Phone 2a supports up to 45W fast charging, but it needs a USB-C Power Delivery (PD 3.0) charger to hit that speed.
Look at the back of your phone. The Glyph Interface LEDs should light up with a pulsing pattern when charging is active. If those lights don't come on at all, that's a sign power isn't getting through. Try a different cable and a different wall adapter to rule out faulty accessories.
Remember, the Phone 2a doesn't have wireless charging. Make sure you're using the USB-C port and that there's no lint or debris packed inside it. A quick blast of compressed air can clear out the port.
Boot Into Safe Mode
If the phone turns on but gets stuck on the Nothing logo or in a loop, a recently installed app could be the culprit. Booting into Safe Mode temporarily disables all third-party apps.
To do this, press and hold the Power button until you see the power menu on screen. Then, tap and hold the "Power off" option. A prompt will appear asking if you want to reboot to Safe Mode. Tap "OK" to confirm.
If your phone starts up normally in Safe Mode, you'll see "Safe mode" in the bottom corner. You can then go to Settings > Apps and uninstall any apps you installed just before the problem started.
Try Recovery Mode for a Deeper Reset
When a standard reboot doesn't help, Recovery Mode offers more tools. First, turn your phone off completely. Then, press and hold the Power button and the Volume Up button together.
Hold them until you feel a vibration and the Nothing logo appears, then release. You'll see a screen with a list of options. Use the Volume buttons to navigate up and down, and the Power button to select.
From here, you can choose "Wipe cache partition." This clears temporary system files that can sometimes become corrupted without touching your personal data. After it completes, select "Reboot system now."
Perform a Factory Reset
This is your last resort before seeking repair, as it will erase everything on your phone. You'll need to use Recovery Mode for this if the phone won't boot normally.
Follow the steps above to enter Recovery Mode. Navigate to the "Wipe data/factory reset" option and select it. You'll have to confirm your choice on the next screen. The process only takes a minute or two.
Once it's done, select "Reboot system now." Your Phone 2a will start up like it's brand new. You'll need your Google account details to set it up again, so make sure you know those credentials.
Inspect for Physical Damage
If the phone has been dropped or exposed to liquid, there could be internal hardware damage. Look closely at the USB-C port for any bent pins or corrosion. Check the Power button to see if it feels loose or stuck compared to the Volume buttons.
A damaged battery can also prevent a phone from turning on. While the battery isn't user-replaceable, if the phone is swollen or the back case is separating, that's a clear sign of a battery issue. In that case, you should stop trying to charge it.
Connect to a Computer
Sometimes, a computer can jump-start a phone that's not responding. Use a known-good USB-C cable to connect your Phone 2a to a PC or Mac. If the computer makes a connection sound or the phone's Glyph lights flicker, it means the device has some power and life.
You can leave it connected for 30 minutes to an hour. The trickle charge from a computer USB port can sometimes provide enough power for the battery management system to wake up, even when a wall charger doesn't seem to work.
Consider the Power Button Itself
It sounds obvious, but the problem might be the button, not the phone. If the button is stuck in a depressed position or has debris under it, it could be constantly registering a press, preventing a normal boot.
Gently press the Power button a few times and listen for a distinct click. Try blowing around the edges of the button with compressed air. If the button feels mushy or unresponsive, the hardware inside may have failed, which requires a professional repair.