spontaneous restart

  1. snipper

    Can a bad video card cause a Mac Pro to spontaneously restart?

    Hi all, I use a Mac Pro 3,1 / early 2008 with a 'PC' card (MSi Twin Frozr III, 2 GB) so I can use it with the large desktop of a 40" Philips BDM4065 '4K' / UHD monitor at 3840x2160. It began restarting spontaneously a few weeks ago. After that, this happend more and more often, up to half a...
  2. D

    Spontaneous restart

    I have a late 2013 iMac running ML. Please don't get on me about not having the latest OS, I have my reasons, i.e. legacy software that won't run on newer OS. OK, now that we have that out of the way, here's my problem. Yesterday, my iMac spontaneously restarted. I wasn't in the room and by...