How to Fix iPhone 12 Won't Turn On

easy difficulty ~15 minutes iOS iPhone 12

Use this guide when your iPhone 12 has a “Won't Turn On” issue. Work through the steps in order — each one includes a diagram so you can follow along on the device.

Symptoms

  • The device shows no lights, no logo and no response to the power button.
  • You may see a brief flash then nothing, or a battery icon that appears then disappears.

Common causes

  • Software glitches after an OS update
  • Background apps exhausting memory or battery
  • Faulty or dirty charging accessories
  • Network settings cache corruption
  • Aging battery or thermal throttling

Step-by-step fix

1

Force a full power cycle

Diagram for step 1: Force a full power cycle
Step 1 — Force a full power cycle

On your iPhone 12, volume up, volume down, then hold the side button until the Apple logo. Wait 30 seconds, then power on again. This clears many temporary freezes without deleting data.

2

Check power and cables

Diagram for step 2: Check power and cables
Step 2 — Check power and cables

Confirm the charger, wall socket and cable are known-good. Try a different outlet. For iPhone 12, watch for any LED, logo or vibration that proves power is reaching the device.

3

Update software where possible

Diagram for step 3: Update software where possible
Step 3 — Update software where possible

Install pending updates from Settings → General → Software Update. Many iOS issues are already patched. Stay on power/Wi‑Fi until updates finish.

4

Clear clutter and conflicts

Diagram for step 4: Clear clutter and conflicts
Step 4 — Clear clutter and conflicts

Open Settings → General → iPhone/iPad Storage and remove huge downloads, unused offline maps/podcasts, and duplicate photos. Low storage makes iPhone 12 misbehave in surprising ways.

5

Reset the relevant setting (not the whole device yet)

Diagram for step 5: Reset the relevant setting (not the whole device yet)
Step 5 — Reset the relevant setting (not the whole device yet)

Reset network settings or the single affected feature from Settings before wiping the whole device. Soft resets fix a large share of cases on iOS.

6

Deep checks before a factory reset

Diagram for step 6: Deep checks before a factory reset
Step 6 — Deep checks before a factory reset

Test in safe/guest mode if available, try another user profile, and note whether the fault is hardware-like (always) or software-like (intermittent after updates). Keep Settings changes documented so you can undo them.

7

Last resort: reset or recover

Diagram for step 7: Last resort: reset or recover
Step 7 — Last resort: reset or recover

Back up first. Then use Settings → General → Transfer or Reset → Reset only if earlier steps failed. After reset, set up iPhone 12 without restoring a suspect backup immediately — test clean, then bring data back in stages.

When to get professional help

Stop and seek professional repair if you smell burning, see a swollen battery, notice liquid damage, or if the iPhone 12 still shows no power after verified chargers and cables. For TVs and laptops with physical panel damage, software steps will not restore the screen.

FAQs

Will these steps delete my data on iPhone 12?

Steps before the final factory reset keep your data. Only a full reset/erase removes personal files — back up photos, chats and documents first.

How long should I spend on this iPhone 12 fix?

Most people finish the soft fixes in about 15 minutes. If hardware symptoms remain (no power, lines on screen, swollen battery), stop and seek a repairer.

Does this guide apply to other Apple devices?

Menus are written for iPhone 12 on iOS. Sister models are often similar, but label names can differ slightly after OS updates.