I've a OfficeJet 4500510g that have worked 'til now in a fantastci way. But... Today I've made a simple B&W print and surprise! Printer take the blank sheet, the power led start to blink and stop! Nothing else! I've made all operations described in the support in the Windows 7 32bit section, without any positive results... I've also made a factory reset (Cancel+OK button) but nothing of nothing... I've also tryed to make a simple print job with another computer, connected via USB cable, but nothing again... Thanks for the answers!