Frozen Computer? Ctrl+Alt+Delete, Force Quit and When to Use Each

A frozen app is one of the most stressful things on a computer, mostly because the first instinct is to hold the power button. That works, but it's the last resort, and it can cost you unsaved work. Go up this ladder one step at a time.

Step 1: Wait 30 to 60 seconds

Seriously. A lot of "frozen" apps are just busy: saving a big file, loading a page, installing an update. If you see the spinning wheel on a Mac or "Not Responding" on Windows, give it a minute before you do anything.

Step 2: Try to close it normally

• Mac: ⌘ + Q quits the app.
• Windows: Alt + F4 closes the window you're in.

If it closes, you're done. If nothing happens, keep going.

Step 3: Force quit just that app

On Windows: Ctrl + Shift + Esc

This opens Task Manager directly. Find the app that says "Not responding," click it and choose End task. This is the fastest way to kill a stuck program.

On Windows: Ctrl + Alt + Delete

This opens a blue (or black) security screen with options to Lock, Switch user, Sign out, Change a password and Task Manager, plus a power button in the corner.

Use it when the whole screen seems stuck or Ctrl + Shift + Esc doesn't respond. Because Windows protects this shortcut at a deeper level, it usually works even when nothing else does. From there, open Task Manager or restart using the power icon.

Bonus Windows trick: if your screen goes black or freezes but the computer seems to be running, press Windows key + Ctrl + Shift + B. It resets the graphics driver. The screen will blink and you'll hear a beep, and often everything comes back.

On a Mac: Command + Option + Escape

This opens the Force Quit Applications window. Pick the frozen app (it'll often say "Not Responding") and click Force Quit.

Holding Command + Option + Shift + Escape for about three seconds force quits whatever app is in front, with no window. It's handy, but make sure you're on the right app first.

Not sure which app is the problem? Open Activity Monitor (⌘ + Space, type "Activity Monitor") to see what's using all the memory or CPU.

On Linux

On many Linux desktops, Ctrl + Alt + Delete opens the log out or power-off menu instead of a task manager. To end a stuck app, open System Monitor (or your desktop's task manager), select the app and choose End or Kill.

On a Chromebook

Press Search + Esc to open the Task Manager, select the frozen tab or app and click End process.

Step 4: Restart the right way

If force quitting doesn't help, restart from the menu:

• Windows: Start → Power → Restart, or the power icon on the Ctrl + Alt + Delete screen
• Mac: Apple menu → Restart

A real restart clears out memory and stuck background processes. It fixes more problems than people expect.

Step 5 (last resort): Hold the power button

If nothing responds at all, no mouse and no keyboard, hold the power button for about 10 seconds until the computer turns off. Wait a few seconds and turn it back on. Anything you hadn't saved will be lost, which is why this comes last.

Quick cheat sheet

If it keeps happening

One freeze is normal. Freezing every day usually means something deeper: not enough memory, a full hard drive, an app that needs updating, a failing drive or malware. That's worth a proper look. Book a quick fix and we'll find the cause instead of just treating the symptom.