If your HP 8610 printer offline, it may be that it is turned off or in sleep mode. Other concerns include network issues, cartridge ink issues, and a faulty USB cable link. The reasons can be the printer can be turned off or in sleep mode when it displays a blank screen. The problem can be overcome. Disconnect the power cord from the socket. Wait for a minute and then re-insert it to resolve the issue. If the situation persists, you'll need to look at other possibilities. This may be due to faulty USB connectivity or a network problem. To elaborate, the USB connection between the printer and the computer must have come off. Tighten the USB cable at both ends.