When the scanner half of an all-in-one stops responding (PC says "scanner cannot be found" or the scan button does nothing), the cause is almost always software-side — the actual scanner hardware rarely fails. Try these in order.
1. Restart in the right order
Power off the printer, reboot your PC, then power the printer back on. About 25% of scanner issues clear with this alone.
2. Check that Windows Image Acquisition (WIA) is running
- Press Win+R, type
services.mscand press Enter. - Find Windows Image Acquisition (WIA).
- Right-click and choose Start. If already running, choose Restart.
- Right-click again, Properties → set Startup type to Automatic.
3. Use the manufacturer's scan utility, not Windows Fax & Scan
Windows Fax & Scan and the built-in Camera app often fail to detect all-in-one scanners. Use the official utility from your printer brand instead:
- HP: HP Smart app
- Canon: IJ Scan Utility
- Epson: Epson ScanSmart
- Brother: iPrint&Scan
Download them from our drivers page.
4. Add the printer as a scanner separately (network printers)
On network all-in-ones, the print driver and scan driver are sometimes installed separately. Go to Settings → Printers & scanners, click your printer and check if Scanner is listed. If not, re-run the manufacturer's full installer.
5. Reinstall the full driver package
If you originally only installed the print driver (the small one) and not the full software suite, the scanner half is missing. Uninstall the current driver, then reinstall using the Full Feature Software package from the manufacturer.
6. Check USB cable / network connection
Scanners need higher bandwidth than print jobs. A flaky USB cable can let printing work fine but kill scanning. Try a different USB cable, or plug directly into the PC (not through a hub).
Still not scanning?
If you've worked through all six fixes, the issue is usually a Windows driver-signing problem on Windows 11 or a specific TWAIN/WIA conflict that needs hands-on diagnosis.
Book a 30-minute remote session — flat $29, no fix no fee.