hi guys i have the same problem. after power failuer on computer and printer. the printer always saya service error 79 and automaticly shutdown.
but i already solved it
1. remove data cable
2. power off the printer
3. remove your printer from your computer(control panel - device and printer)
4. delete printer driver - from control panel - administrative tools - printer management - choose all printer - right click the printer - click delete
5. plug cable data from printer
6. turn on printer
7. windows automaticly instal the driver(i'am using windows 7 pro)
sorry for bad english
Thanks