Take a deep breath. A PC that will not turn on is scary, but it is rarely the end of the story. Most of the time the fix is simple, and you can do it yourself. This guide walks you through every step, from the easy checks to the advanced repairs. Follow them in order, and do not skip ahead.

Step 1: Check the Basics First

Before anything else, rule out the simple stuff. These checks take one minute and solve the problem more often than you would think.

• Power cable: Push the power cable firmly into the back of the PC and into the wall socket. Cables work loose over time.
• Wall outlet: Plug the PC directly into a wall outlet, not a power bar. Power bars die silently. If you suspect the outlet, test it with a phone charger.
• Monitor: Is the monitor itself turned on? Check its power light and its cable. A “dead PC” is very often just a monitor that is off or unplugged.
• Desktop power switch: Many desktops have a small I/O rocker switch on the back of the power supply. Make sure it is set to I (on), not O (off).
• Laptop: Unplug the charger, then hold the power button down for 15 seconds. Plug the charger back in and try again. If your battery is removable, take it out and try starting on the charger alone.

Step 2: Listen and Look for Clues

Press the power button once and pay attention. What the PC does tells you where the problem lives.

• Nothing at all, no lights, no fans: This is a power problem. Go back to Step 1 and check every cable and outlet again.
• Fans spin but the screen stays black: Check the monitor cable on both ends, and try a different cable or port if you have one.
• Beeping sounds: Those beeps are error codes from the motherboard. Count them (for example, three short beeps), then search the web for your PC or motherboard model plus “beep codes”. This usually points to memory or graphics hardware.
• Windows logo appears, then it fails: This is a software problem, not a dead PC. The steps below are made for exactly this.
• Clicking or grinding noise from the PC: That is likely a failing hard drive. Stop here, do not keep restarting it, and read the FAQ at the end.

Step 3: Let Windows Repair Itself

Windows has a built-in repair tool. It scans your system and fixes common startup problems on its own. Here is how to reach it on each version.

Windows 11: Turn the PC on. As soon as you see the Windows logo, press and hold the power button until it shuts off. Do this three times in a row. On the next start you will see “Preparing Automatic Repair”, then a blue “Choose an option” screen. Click Troubleshoot, then Advanced options, then Startup Repair. Pick your account, type your password if asked, and let it run.

Windows 10: Exactly the same as Windows 11. Force shutdown three times at the logo, then on the “Choose an option” screen go to Troubleshoot, then Advanced options, then Startup Repair.

Windows 8: The force-shutdown trick works here too. If you can reach the login screen, there is an easier way: hold the Shift key, click the Power icon, then click Restart. On the “Choose an option” screen, click Troubleshoot, then Advanced options, then Automatic Repair.

Windows 7: Restart the PC and tap the F8 key repeatedly before the Windows logo appears. Use the arrow keys to select Repair Your Computer and press Enter. Choose your keyboard layout, log in, and click Startup Repair. If “Repair Your Computer” is not in the list, you will need your Windows 7 DVD: boot from it and choose “Repair your computer” instead.

Step 4: Try Safe Mode

Safe Mode starts Windows with only the bare minimum drivers and programs. If your PC works in Safe Mode, the problem is almost certainly a bad driver, a bad update, or a startup program. That is good news, because those are fixable.

Windows 11: From the blue “Choose an option” screen (see Step 3), click Troubleshoot, then Advanced options, then Startup Settings, then Restart. When the list appears, press 4 or F4 for Safe Mode. Press 5 or F5 if you also need internet (Safe Mode with Networking).

Windows 10: Same path as Windows 11. Shortcut: on the login screen, hold Shift, click the Power icon, then click Restart. Then Troubleshoot, Advanced options, Startup Settings, Restart, and press 4.

Windows 8: On the login screen, hold Shift, click the Power icon, then click Restart. Then Troubleshoot, Advanced options, Startup Settings, Restart, and press 4.

Windows 7: Restart and tap F8 before the logo appears. Select Safe Mode from the Advanced Boot Options menu and press Enter. Note: the F8 trick does not work on Windows 8, 10, or 11 because of fast startup, so use the steps above for those versions.

What to do once you are in Safe Mode: Think about what changed just before the problem started. A new driver? Undo it in Device Manager (right-click the device, then Properties, then the Driver tab, then Roll Back Driver). A Windows update? Open Control Panel, then Programs and Features, then “View installed updates”, and uninstall the newest one. Then restart normally.

Step 5: Roll Back with System Restore

System Restore rolls your system files and settings back to an earlier point in time. It does not touch your personal files, photos, or documents. If the PC worked fine last week, this can undo whatever broke it.

Windows 11: From the “Choose an option” screen, click Troubleshoot, then Advanced options, then System Restore. Pick a restore point dated before the problem started, then follow the wizard.

Windows 10: Same path: Troubleshoot, then Advanced options, then System Restore.

Windows 8: Same path: Troubleshoot, then Advanced options, then System Restore.

Windows 7: Restart, tap F8, select Repair Your Computer, log in, and click System Restore. Windows 7 creates restore points automatically, so you will probably have one to choose from.

Step 6: Repair the Boot Records (Advanced)

If Windows cannot even find itself, the boot records may be damaged. You can rebuild them with a few commands. Take your time and type each one exactly.

Getting to Command Prompt: On Windows 11, 10, and 8, go to the “Choose an option” screen, then Troubleshoot, Advanced options, Command Prompt. On Windows 7, tap F8, select Repair Your Computer, log in, and click Command Prompt.

Type each command below, pressing Enter after each one. Wait for it to finish before typing the next.

• bootrec /fixmbr (rewrites the master boot record)
• bootrec /fixboot (writes a new boot sector)
• bootrec /scanos (looks for Windows installations)
• bootrec /rebuildbcd (rebuilds the boot configuration)

If it asks whether to add an installation to the boot list, type Y and press Enter. When done, close the window and restart.

Heads up for newer PCs: On modern Windows 10 and 11 PCs, the bootrec /fixboot command sometimes replies “Access is denied”. That is normal on these systems and not your fault. If that happens, close Command Prompt and use Startup Repair from Step 3 instead. Do not experiment with diskpart commands unless you know exactly what you are doing.

Step 7: Make a Bootable USB on Another PC

If your PC will not even reach the repair screens, you can run all the same tools from a USB stick. You will need a working computer, a USB drive with at least 8 GB of space, and an internet connection for the download.

Windows 11: On the working PC, open Microsoft’s official “Download Windows 11” page and download the Media Creation Tool. Run it, accept the license terms, choose “Create installation media for another PC”, select your language and edition, choose USB flash drive, pick your USB drive from the list, and wait for it to finish.

Windows 10: Same process using the “Download Windows 10” page and its Media Creation Tool.

Windows 8: Microsoft no longer widely offers the Windows 8 media tool. If you have a Windows 8.1 ISO file, you can write it to USB with a free tool like Rufus on the working PC.

Windows 7: Download a Windows 7 ISO (you will need your product key) and write it to USB using Microsoft’s free Windows 7 USB/DVD Download Tool on the working PC.

No second PC or no internet? This is the honest offline reality: you cannot download the tool without internet. Ask a friend or family member to make the USB for you, or use a computer at a public library. Keep the finished USB somewhere safe afterwards. It is the best rescue disk you can own, and it costs nothing.

Using the USB: Plug it into the broken PC and turn the PC on. Immediately start tapping the boot menu key (common ones are F12, F2, Esc, or Del; it usually flashes on screen for a second). Select your USB drive from the menu. When the Windows Setup screen appears, do not click Install. Click Repair your computer in the bottom-left corner instead. You are now back at the “Choose an option” screen with all the tools from Steps 3 to 6.

Prevention tip: On any working Windows 10 or 11 PC, type “Recovery Drive” in the Start menu and follow the wizard to make a recovery USB now, before trouble strikes. Future you will be grateful.

Step 8: The Last Resort, Starting Fresh

If nothing above worked, a fresh start usually will. This is the last step because it takes the most time, not because it is dangerous, as long as you pick the right option.

Windows 11: From the “Choose an option” screen, click Troubleshoot, then Reset this PC. Choose Keep my files first. Windows reinstalls itself and keeps your personal files, though you will need to reinstall your programs.

Windows 10: Same path: Troubleshoot, then Reset this PC, then Keep my files.

Windows 8: Click Troubleshoot, then Refresh your PC to keep your files, or Reset your PC to wipe everything and start fully clean.

Windows 7: There is no built-in reset. First, save your files: boot from a Linux live USB (Ubuntu works well) and copy your files to an external drive. Then reinstall Windows 7 from your DVD or USB installer.

Only choose “Remove everything” if you have a backup of your files. And if this whole scare taught you one thing, let it be this: a regular backup makes a dead PC a minor inconvenience instead of a disaster. Here is our simple Windows backup routine that actually works.

Frequently Asked Questions

My PC makes a clicking noise and will not boot. What does that mean?
Clicking from inside the PC usually means a failing hard drive. Stop restarting it over and over, because every spin can make recovery harder. If the files matter, take it to a repair shop and ask about data recovery before trying anything else.

I see “No bootable device” or “Operating system not found”. Is Windows gone?
Not necessarily. It means the PC cannot find Windows to start it. Check the boot order in your BIOS or UEFI settings, and on a desktop, check that the drive cables are seated firmly. If the drive is healthy, the bootrec commands in Step 6 can often fix this.

Will Startup Repair or System Restore delete my files?
No. Startup Repair, System Restore, and Safe Mode do not delete your personal files, photos, or documents. The options that do erase things are clearly labeled, like “Reset this PC” with “Remove everything”, or a clean install.

How do I know if it is a hardware problem or a software problem?
No lights, no fans, beeping, or clicking points to hardware. If Windows starts to load and then fails, with a logo, a blue screen, or the repair screens, that points to software, and this guide is exactly what you need.

My laptop turns on but the screen stays black. Is it dead?
Maybe not. Shine a flashlight at the screen at an angle. If you can see a faint image, the backlight has failed but the laptop works. Also try connecting an external monitor or TV. If that shows a picture, your laptop screen or its cable is the problem, which is a cheap fix at a repair shop.

Is it safe to force shutdown three times to trigger Automatic Repair?
Yes. Two or three forced shutdowns at the Windows logo is the standard way to trigger it, and Windows is designed for this. Just stop forcing shutdowns once the repair screen appears and follow the on-screen steps instead.

Startup Repair says it could not repair my PC. Now what?
Do not panic. Move on to Step 4 (Safe Mode) and Step 5 (System Restore). If those fail too, Step 6 (bootrec commands) and Step 8 (Reset this PC with “Keep my files”) are your next moves, in that order.

You Have Got This

A PC that will not boot feels like an emergency, but now you have a plan. Start with the easy checks, let Windows repair itself, and work your way down the list. Nine times out of ten, one of these steps brings it back to life.

And when your PC is healthy again, do the one thing that makes the next scare painless: set up a backup. Our simple Windows backup routine takes a few minutes and covers Windows 7, 8, 10, and 11.