Hi,
First step is to find out if the fault is hardware. To do so print any of the printers internal pages (config page, event log etc..) If the internal prints are working ok, but blank when sending a job from the computer, then your fault is nothing to do with printer hardware.
If the printer internal prints are also coming out blank, then you have a hardware issue, so you may be looking at a faulty toner.. But could also be a failure of high volatge contacts, Transfer Roller, laser scanner etc..