I have an annoying problem with my PC randomly switching off when Windows is loading. It will finally load Windows on the second or third attempt. It will also switch off when Windows has loaded and I'm logged in but this is rare. The PC usually boots okay in safe mode. It seems to need time to 'warm-up'.
I have replaced the case and PSU but no luck. Fans are working okay. Speed fan shows the following info with some hot temp readings and a couple of suspect voltages: