I forget, did you reseat RAM and run memtest86 overnight yet?I replaced the PSU and it still shuts off and restarts next task try another Graphics card and also to play safe change the AMD CPU cooler and replace thermal paste,also thought about reinstalling windows 10 on a cleaned drive.
I used zeroes it took about an hour only 160GBI use 'format' which writes zeroes - and not 'quick format'