Windows 10: my windows 11 desktop will not recognize my scanner unless it is turned on when the...

The scanner must be turned on before the computer boots. Windows 11 does not recognize it otherwise. I have to reboot the computer with the scanner turned on for it to recognize it. The connection is USB. This is definitely a bug.

:)

 

Win 10 does not recognize scanner


I hesitate to suggest this, because it's far from free ($40/$80 for standard/pro), but Vuescan has your scanner on its supported list:

VueScan Scanner Software for Windows, Mac OS X and Linux

 

Unable to get Win10 to recognize EPSON 4870 Photo Scanner

I'll walk you though the steps I do to install my Perfection 1200. I have to do this periodically for some reason to reestablish the 'non-standard' Perfection 2400 driver.

1. Right click on the scanner in Device Manager (as Admin) and select Update Driver. Then select the option to browse my computer for driver software.



2. Then select Let me pick from a list of device drivers....



3. Select Imaging Devices from the next list.



4. Finally, select the correct Epson driver you have installed then click Next. If it isn't listed then something has gone wrong with the driver installation.



5. Hopefully, the scanner should now work?

 

Scanner

Hi JSmith,

Your scanner should be installed first in order for your computer to recognize it. Since you're using a printer/scanner in one, you need to add or install the device as a printer and as a scanner. Make sure that the printer is properly connected to your
computer and is turned on when you try to install it. Follow these steps:

• Click Start > Settings > Devices.
• Under Add printers & scanners, click the + sign and select
  Add device.

Once added, try checking if you're able to scan. If your computer still doesn't detect the scanner, then we suggest that you get in touch with HP Support for further assistance.

Feel free to let us know if you need more information.

Regards.