DavidPine Loc: Fredericksburg, TX

Call Canon support. Wonderful service and knowledgable people.

DavidM Loc: New Orleans, LA

I use mine over wifi, check if your wifi is working and you haven't changed the password on it.Check your settings on your printer.

https://en.canon-cna.com/support/consumer_products/pixma_printer_wireless_connection_setup/pro100_printer_wireless_connection_setup/

yssirk123 Loc: New Jersey

I've had a Canon Pro-100 for years and it's been essentially bulletproof, with one exception involving communication from computer to printer. Try downloading the current firmware update from the Canon website and re-install it - worked for me.

Dickbas Loc: Southern New Jersey

Be sure to check the flimsy plastic flap that you have to move in order to load paper in the top rear feeder. If this "flap" isn't closed the printer will just sit there and the "Print Que" will just accumulate all of your print requests.
On your computer, I would look at your "Print Que" and "Pause" and then delete all previous Print Jobs.
Next, I would ensure your photo paper is properly inserted into the feeder and that there are no "jams".
Next, turn the printer off, then back On.
Finally, I would close the feeder "flap" door.

Then send a print job to the printer. Watch the lights around the two large buttons on front of the printer. Flashing White on the top button is a great sign that all is okay. An orange/yellow flashing light on middle large button usually indicates problems with 1. No Paper in feeder, 2. Jammed Papering feeder, 3. Flap Door not closed, or 4. Print Que is "Paused" at the computer.
Hope this helps.

lamiaceae Loc: San Luis Obispo County, CA

Exactly where I have problems when I forget any of those items.

Sinewsworn Loc: Port Orchard, WA

I often have to reload the printer driver from Canon.

augieg27 Loc: Central California

I just reinstalled it and was able to make it work.

Thank you for your suggestion.

augieg27 Loc: Central California

I want to thank you all for your suggestions on how to fix my Canon Pro-100 printer..

Finally, I ended up reinstalling it and with that it is now working.

I am in awe for the assistance received from this terrific group of photographers.

Augie

Sinewsworn Loc: Port Orchard, WA

Pain in the ass but works!