Stopped printing while in the middle of a big job with full ink tanks, then when turned back on, gave the dreaded U052 print head error message.  I have tried everything given by Canon to re-start the printer, nothing works.

It dawns on me that maybe my ink tank stopped feeding ink despite the tank being full- the vent hole might not have been open all the way to allow ink to pass through.

I'm wondering whether this could somehow mess up the printhead, maybe it needs ink to keep it cool during operation or something??

It's completely aggravating that it stopped as it has and now that prevents even the scanner or fax from working-- this seems like a bad design.

Does anyone know whether the print head can be messed up if the tank stops feeding ink while in the middle of a print job?

Thanks!  And if you know that answer, then what do you do to get printer working again??

Thanks!