For the Dell Printer Offline error, follow these instructions. On PC, locate the device management settings in the control panel. Scroll to the USB controller area and press plus or arrow to expand the list. Moreover, choose the Properties option from the context menu of each USB Root Hub. Go to drop-down and select Power Management. Allow the computer to turn off this device to conserve power by ticking it by default; uncheck it. Restart your computer as well, if required. Return to step one, scroll to Network Adapters, right-click the wireless adapter, select Properties > Power Management, and deselect the corresponding checkbox.