IMac will not recognize scanner

My iMac 10.6.4 will not scan. I have an HP Deskjet F4280; it will print fine, but when I try to scan using HP scan pro, or Adobe Acrobat, or Photoshop, it says "An error occurred while communicating with the HP imaging device." I've tried uninstalling and reinstalling the Adobe software, but nothing works. It started doing this with a previous HP printer--worked fine for several months, then just quit. Now it's doing the same with this new printer. But it prints fine.

This is really weird I have been using the same HP printer/scanner C3100 but suddenly it won't recognize or scan;however, it will print and make copies
Yes, I have updated all the drivers and nothing, I wouldn't try contacting HP they charge an outrageous hourly rate to answer a stupid question.
Any suggestions

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IMac will not recognize scanner

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