hi UPDATE pls can anyone help with suggestions just happened again pc been on all day yesterday opnly done it once then been on for few hours and now just done it again then affter 1 tro 2 minutes it will let me turn it back on . I opened pc took cpu fan off cleaned re applied new thermal paste to cpu used compressed air to blow out any dust in case and took out ram and replaced . all working at mo but any suggestions would be great //