BrewPi is sick

No response from the web server. Can't SSH either. Tried plugging a network cable in directly in case it was the wifi still no joy, tried another power supply but no different. I suspect a dead SD card as I get only one red light and no flashing on the Pi. Interestingly the arduino continues to function in fridge constant mode at 12c. I've taken the poor guy out of service while I get a new SD card. The beer fridge is in DR mode using the old greenhouse controller.