After months of good functionality, iMac now doesn't recognize Epson GT 20000

This hit me out of the blue. I've been running Mavericks with an Epson GT 20000 scanner for months with no problems. Today, the scanner cannot transmit scanned images back to the iMac. After scanning, the spinning wheel of death hits in Epson Scan, which apparently means the scanned image can't be sent to the iMac . I have had some success today via Preview or System Preferences, but not consistantly or reliably. Reinstalled scanner driver, checked connections etc. Now iMac can't see the scanner.

Turn the scanner off as well as your Mac then turn the scanner on and restart your Mac.
Try scanning ...
Mac Basics: Using a scanner

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