iPhone 8 Overheating and Won’t Turn On? Here’s What to Do

An iPhone 8 that’s overheating and not powering on can be a sign of either a serious hardware failure or a deep software glitch. If your device is heating up unexpectedly, stuck on a black screen, or refusing to boot, don’t panic just yet—there are a few ways to figure out what’s wrong and how to fix it.

Below are the best steps you can take to troubleshoot this issue, along with solutions for a stuck power button and battery glitches.

1. Try a Force Restart

If your iPhone screen has gone black but the device is still warm or showing notifications, it might just be frozen.

To force restart:

Press and quickly release the Volume Up button.
Press and quickly release the Volume Down button.
Press and hold the Side (Power) button until the Apple logo appears.

If nothing happens after this, move on to the next steps.

2. Inspect the Power Button for Physical Damage

A stuck power button can cause an iPhone to reboot endlessly or fail to turn on.

Check if:

The button feels too tight or loose.
Pressing it doesn’t produce the usual click.

If the button is stuck, it may be shorting out or constantly sending restart signals, which can lead to overheating. This will need a hardware repair—contact Apple Support or visit an Apple Store.

3. Try a Different Charging Cable and Adapter

Faulty charging accessories can overheat your iPhone or fail to power it correctly.

Use a certified Lightning cable and Apple charger.
Try plugging it into a different power outlet or computer USB port.
Let it charge for at least 30 minutes before attempting to power it on again.

4. Attempt a DFU (Device Firmware Update) Restore

If the iPhone won’t boot but is still recognized by iTunes or Finder, a DFU restore might work.

⚠️ Only do this if you suspect software failure—not hardware—since DFU restore erases your data.

Steps:

Plug your iPhone into a computer with iTunes (Windows/macOS Mojave) or Finder (macOS Catalina+).
Press and hold the Power button for 3 seconds.
While holding Power, press the Volume Down button and hold both for 10 seconds.
Release the Power button but keep holding Volume Down for another 5 seconds.
If the screen stays black and iTunes/Finder detects the phone, you’re in DFU mode.
Follow on-screen instructions to restore your iPhone.

5. Check for a “No Power” Issue

If the iPhone shows no signs of life—no screen activity, no vibrations, and no sound—it could have a total power failure. Causes might include:

Damaged motherboard
Battery or charging IC failure
Heat damage

At this point, your only option is to have Apple or a certified technician inspect the device. Apple may need to replace internal components, and your data may not be recoverable if the phone can’t power on.

Fixing a Stuck Power Button (Related Issue)

If your iPhone 8’s power button is jammed or unresponsive:

Try gently pressing around the button’s edges to dislodge dirt or debris.
If that doesn’t help, contact Apple Support for repair.

You can temporarily shut off the screen via AssistiveTouch in Settings > Accessibility > Touch > AssistiveTouch.

Battery Shows 100% Then Drops to 1% (Battery Calibration Fix)

If your iPhone battery percentage jumps around or dies unexpectedly:

Drain the battery completely until it powers off.
Charge it to 100%, then let it charge for another 1–2 hours.
Unplug and restart the phone.
Use the phone until it fully drains again.
Repeat the process once more.

This helps the operating system re-learn accurate battery reporting. If the issue persists after calibration and a factory reset, it’s time to consider battery replacement.

When to Contact Apple

If your iPhone:

Gets extremely hot and won’t turn on
Has a physically damaged or unresponsive power button
Has a battery that drains instantly or fails to hold charge
Won’t respond even in DFU mode

Then it’s time to reach out to Apple Support or visit a Genius Bar for diagnostics and repair.