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My serial monitor window opens frozen, without any output or possibility to input, or even activate the window. Sketch is very simple, but behavior is same even with empty sketch, so I assume problem is not in sketch. I also checked if sketch is uploaded correctly by uploading simple sketch with blinking diode, which worked.

Same behavior with Arduino Nano and Uno.

I tried to reinstall IDE, uninstalled, removed and reinstalled serial driver (ch340) with no success.

I can see Serial monitor window only on windows taskbar, it won't activate after click.

Until now I haven't had any significant problems with IDE or serial monitor for years.

window state

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  • Is it uploading at all? – timemage Feb 16 at 17:07
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    Yes, sketch is correctly uploaded, I tried to upload another simple sketch with blinking LED, which worked. – pavokraj Feb 16 at 17:13
  • IDE version? Did you get it through the website or the windows store? If you get it from the website, which file did you use? – timemage Feb 16 at 17:26
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    I got it from windows store, version is 1.8.13 (Windows Store 1.8.42.0) – pavokraj Feb 16 at 17:35
  • Do you anything plugged in or connected to the Arduino besides the USB cable to the PC? – timemage Feb 16 at 17:49
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Try updating the java. Also check whether the device manager shows the USB serial port without any yellow warning sign on it. If there is a current short in the usb port that specific port will be off for safety, restarting the computer should resolve that problem.

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  • Until now I haven't had Java installed, no change in behavior after installation. I restarted computer many times in the process. Driver is correctly installed, and device in device manager is working correctly both with old and new driver. – pavokraj Feb 17 at 7:41
  • The IDE runs on a JVM bundled with the IDE. – timemage Feb 17 at 12:08
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Unfortunaltely, nothing worked, and after hours of trying and googling I reinstalled windows, and now Serial Monitor works correctly.

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