February 3, 20233 yr Hi, I am having trouble starting the Garmin 430 and 530 in the Cessna 172 Classic. They power up with the Avionics switch but nothing appears on the screens except " Conducting Self Test. I wait for several minutes but nothing happens and the control knobs don't seem to work with the display screen. Any ideas? Thanks. Tom Edited February 3, 20233 yr by Flaps30
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