ok, last update: together with the mac technician at work we tried installing again the drivers for the scanner, didn't work. it did work on an imac with os 10.5, so the scanner is ok. my computer did recognize the scanner connected with usb, but the scanning software (toolbox, vuescan, silverfast, ps plugin) didn't. we also tried it with the 4400F on a mac running lion, as was recommended by wmsey here, didn't work.
guess i have to sell the scanner, unless someone has an idea where to get a driver.
thanks.
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