Make sure the printer is turned on (the power light should be solid, not blinking). Check that the paper tray has paper and that the ink or toner cartridges aren't empty — most printers show a warning light when ink is low. Also confirm the USB cable is firmly plugged in on both ends, or that the printer is on the same WiFi network as your computer.
Turn the printer completely off using its power button, wait 30 seconds, then turn it back on. Do the same with your computer. This clears temporary errors that prevent printing and resolves the problem about 30% of the time on its own.
Windows: Click the Start menu and search for Printers & scanners. Click your printer, then Open print queue. Select all documents and click Cancel. Mac: Go to System Settings › Printers & Scanners, click your printer, then Open Print Queue and delete all jobs. A stuck job at the top of the queue often blocks everything behind it.
Windows: Go to Settings › Bluetooth & devices › Printers & scanners, click your printer, and select Set as default. Mac: Go to System Settings › Printers & Scanners and set the default printer in the dropdown. Sometimes documents silently send to an old or virtual printer instead of yours.
Visit your printer manufacturer's website (hp.com, canon.com, epson.com, etc.), search for your printer model, and download the latest driver. Uninstall the old driver first through Settings › Apps, then install the new one. Outdated drivers are a very common cause of printers suddenly stopping.
Go to Settings › System › Troubleshoot › Other troubleshooters and run the Printer troubleshooter. It automatically detects and fixes common driver and spooler issues that would otherwise require manual steps.
If you've been through all six steps and the printer still isn't working, try removing the printer entirely from your computer and adding it back fresh. On Windows, go to Printers & scanners, click your printer, and select Remove device. Then click Add a printer or scanner to reinstall it. This gives your computer a completely clean connection to the printer.
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