4C Plus no longer boots

My 4C Plus has suddenly decided not to boot. i have tried using different images on different SD cards and also tried to connect with both putty and minicom from my Linux box and my Win10 laptop but no luck. Windows detects it when connected and I can lsusb to see it on Linux but there is no output in putty or minicom, the green LED is solid on, no flickering or any other signs of life to it. Anything I can try?