You turn on your computer one day and Windows refuses to boot—what do you do? “Windows won’t boot” is a common symptom with a variety of causes, so you’ll need to perform some troubleshooting.
Modern versions of Windows are better at recovering from this sort of thing. Where Windows XP might have stopped in its tracks when faced with this problem, modern versions of Windows will try to automatically run Startup Repair.
First Things First: Has Anything Changed?
Be sure to think about changes you’ve made recently—did you recently install a new hardware driver, connect a new hardware component to your computer, or open your computer’s case and do something? It’s possible the hardware driver is buggy, the new hardware is incompatible, or that you accidentally unplugged something while working inside your computer.
If the Computer Won’t Power On At All
If your computer won’t power on at all, ensure it’s plugged into a power outlet and that the power connector isn’t loose. If it’s a desktop PC, ensure the power switch on the back of its case—on the power supply—is set to the On position. If it still won’t power on at all, it’s possible you disconnected a power cable inside its case. If you haven’t been messing around inside the case, it’s possible the power supply is dead. In this case, you’ll have to get your computer’s hardware fixed or get a new computer.
Be sure to check your computer monitor—if your computer seems to power on but your screen stays black, ensure your monitor is powered on and that the cable connecting it to your computer’s case is plugged in securely at both ends.
The Computer Powers On And Says No Bootable Device
If your computer is powering on but you get a black screen that says something like “no bootable device” or another sort of “disk error” message, your computer can’t seem to boot from the hard drive that Windows was installed on. Enter your computer’s BIOS or UEFI firmware setup screen and check its boot order setting, ensuring that it’s set to boot from the correct hard drive.
If the hard drive doesn’t appear in the list at all, it’s possible your hard drive has failed and can no longer be booted from.
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