Dell 2350d/dn Mono Laser Printer - Manual (Page 151)

Is the printer cover closed properly?
Try turning your printer off and back on again. If your printer is still not operating properly, call for service.
If you are able to print, press the Menu button
to print a menu settings page, which lists the printer
model type and other information the service representative may need to know.
For more information, contact Dell at support.dell.com .