Printing problem with Sierra installation

[Jorge]

Immediately after upgrading to Sierra on my IMac I could no longer connect to the printer (Cannon, error 300). As best as I can tell the printer driver for Sierra is the same as I had for El Capitan. What else to investigate??

 

[oldscribe]

Hi,

Have you tried deleting it then re adding it in printers -system preferences?

 

[Jorge]

Thanks for the suggestion. Unfortunately the problem I have is more complicated, namely, I am unable to open system preferences ( and About this Mac) under the Apple and therefore cannot follow your suggestion.

 

[Pasquanel]

If you cannot open system preferences or about this Mac you have bigger problems than printer access. Have you tried running First Aid from disk utility?
Do you have a backup? Perhaps download and run Onyx (http://www.titanium.free.fr/onyx.html)
Personally if I had everything backed up I would start over with a clean install instead of an upgrade.