Teensy 3.5 won't enter program mode

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martinem

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Teensy 3.5, Windows 10. Arduino 1.8.12. Teensy loader 1.52. Code is "blink" from example library, with delay parameter changed to 200. I have tried several cables, USB ports, three different windows computers. I have read the FAQ's, tried rebooting and plugging while pressing button. Tried only this one chip though.

Pressing the Teensy button results in maybe a little shorter "off" cycle in the blinking only once and then it goes back to 0.5 Hz blinking. After a second comes three notes from windows like when unplugging a USB device. Even when holding the button down the blinking continues.

Error message from arduino IDE is

"Teensy did not respond to a USB-based request to enter program mode.
Please press the PROGRAM MODE BUTTON on your Teensy to upload your sketch."

Only one action have had any effect. If I hold the teensy button pressed while trying to load the program the blinking stops! After a while I get:

"error sending reboot command (HID)"

and the the same error message as above.

Any help would be highly appreciated.

Thankyou /Martin Essen-Möller, Stockholm
 
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