You were right! If anyone else is running into a similar issue, please just order a new cable. The cable I was using was one I used with a particle io project, which literally gets code via wifi, so it didn't require a cable with data wires, just...
Try a 4th cable!
Slow blink on the red LED (near USB connector) means Teensy is waiting for your PC to begin USB communication.
I know it seems unlikely, but all 3 of those cable are probably power-only cable without data wires. They're...
Howdy,
Reaching out as I have gotten a Teensy 4.0, which lights blinks orange near the 14 pin, and once the button is clicked, blinks red towards the 3V pin.
I am using a Mac and I have tried 3 cables at this point, I am not sure what other...