Teensy 4.1 not appearing in IDE list.

AJL Electronics

AJL Electronics

Well-known member
I have been using a T3.6 without issues. Connecting the same computer and cable to the Teensy 4.1, it is not recognised and is missing from the list of boards. It doesn't appear in the list that can be loaded either. The Teensyduino add on has been setup and all other Teensy boards are there except the 4.1. Device manager appears to do something when plugged and unplugged, but can't see what changes. Board is running Blink, as new. Pressing the button gives a steady red LED programing mode indication. Teensy loader does not appear.

In case it is relevant, I have a Teensy 4.0 here which claims to be a Teensy 3.1/3.2 in the IDE 2.3.4 with the same cable and PC.
 
In Devices, I have checked that it appearsas a USB keyboard. Removing that device and reinserting Teensy reloads it, so I am confident that the hardware is OK. My suspicion is that the loading of Teensyduino boards manager is failing. I do see it "loading" before the window disappears once in a while, so I suspect it is silently aborting.
 
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