There is something fishy going on with Intel attempting to cause shutdown if you use less expensive support chips with their main line processors. I have found documents on this going back several years. I have a case open with Intel right now and they are denying. No ideas what tripped it to go koo koo but I believe it. I just ran an Intel provided CPU test and its perfect. Whether hot or cold, in windows, or sitting at a prompt to choose BIOS options at 30 minutes it powers off. Nothing in the windows logs. Absolutely zero load waiting in BIOS for you to choose an option. And again, exactly at 30 minutes. Sleeping resets it, so its tied to a timer in a powered up chip. Again, BIOS would not allow this. And the BIOS has not been updated. There are other random posts about this but no clean answers. Forced purchase of a new laptop after X hours of use?? PS - My system I an HP EliteBook 850 G1 Notebook PC ENERGY STAR