I was surprised not to find more info on this issue with googling. My PSC 1510 will not scan in Snow Leopard. I know this was a popular printer, so I thought if everyone had this trouble, it would show up in search. Since hp support is built-in to SL, I stopped using the HP scanning software. This printer is listed as being supported by HP in SL. I've tried using Preview, Image Capture, and Print & Fax to scan. No luck. The iMac says scanner cannot be found, and my MBP says scanner is warming, and it never does anything. Correct drivers are installed.