Canon EOS REBEL T7i Instruction Manual page 452

Troubleshooting Guide
Dots of light appear on the image.
White, red, blue, or other colored dots of light may appear on images if
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the sensor is affected by cosmic rays, etc. Their appearance may be
suppressed if you perform [Clean nowf] under [53: Sensor
cleaning] (p.327).
Sensor Cleaning Problems
The shutter makes a sound during sensor cleaning.
When you select [Clean nowf], the shutter will make a mechanical

sound, but no picture is taken (p.327).
Automatic sensor cleaning does not work.
If you repeatedly turn the power switch <1> and <2> within a

short time period, the <f> icon may not be displayed (p.43).
Computer Connection Problems
Communication between the connected camera and
computer does not work.
When using EOS Utility (EOS software), set [z5: Time-lapse movie]

to [Disable] (p.284).
I cannot transfer images to a computer.
Install EOS software on the computer (p.474).

While a Wi-Fi connection is established, the camera cannot be

connected to a computer with an interface cable.
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