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---
breadcrumbs:
- - /chromium-os
- Chromium OS
- - /chromium-os/how-tos-and-troubleshooting
- How Tos and Troubleshooting
page_name: debugging-hangs
title: Debugging system hangs (go/cros-debug-hang)
---
If your Chromebook appears hung (i.e. the screen is frozen and the keyboard
and/or trackpad are unresponsive), try the following steps:
* Pre-Recovery Steps
* Note any visible system indicators like LEDs. Are they blinking
or solid. What color?
* Note charging/discharging behavior if possible. Does plugging a
charger in change LED.
* Note USB response. Does touching an gnubby blink. Does charging
a phone via a USB port work?
* Recovery Steps
* Press **Alt+VolumeUp+X**. If you're using a Chromebox, use F10
instead of VolumeUp. These three keys need to be pressed in that
order.
* This should cause the Chrome browser to restart, and it may
take a few seconds. If the system becomes responsive, go to
last step.
* Press **Alt+VolumeUp+X** a second time.
* This should cause the kernel to panic-reboot. If the system
becomes responsive, go to last step.
* Press **Alt+VolumeUp+R** which should cause a warm reset &
reboot. If so, go to last step. (This may not work on older
hardware.)
* Press and hold the **power button** for 8+ seconds and the
system will power off (if shutdown is clean) or it will reboot
via EC reset
* Press **Refresh+Power button(F3).** This causes an EC reset on
most systems and should be used only as a last resort as it
minimizes the amount of available debug info.
* Last Step
* Power on (if necessary) Log in, and immediately file feedback
using Alt+Shift+i.
* Make sure that "Send system and app information" is checked.
* Make sure to identify what recovery steps you used including
the ones you believed failed.
You may also be able to see crash report IDs at chrome://crashes.
For a complete and up-to-date list of debug key sequences including those for
ChromiumOS devices without a keyboard check
[here](https://chromium.googlesource.com/chromiumos/docs/+/HEAD/debug_buttons.md).
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