Yesterday I made my first print and it went all OK. After the print I have allowed everything to cool down and powered the printer off (leaving both power supply and USB cables connected). Today I have turned the printer on and the power supply has immediately shut down (it was quite warm). I have turned the printer and the power supply off and let them both cool down. After 1 hour I gave it another try. The printer has turned on, the LCD screen was showing the usual stuff, but I could not establish connection with the printer (tried CURA and pronterface). I have checked if system detects the USB device, but plugging and unplugging USB cable did not show anything in dmesg. The temperature sensor readings on LCD were showing 117 and 119 degrees, although both nozzle and bed were cool. I tried using LCD control, but I could not make the printer do anything: have tried homing, but only thing that happened was Z motor buzzing for a minute and stopping.
Do you guys have an idea what could have happened?