I have had an issue with my computer shutting off randomly for a few months now. First, it happened when I first started playing Dark Souls 2. I could get about 3 minutes into playing before it did a hard shutdown. It was the most graphically intense game I had tried to play on my computer by far, but my card and processor were equipped for it.
My first thought was definitely overheating, but after some diagnostics that was ruled out. I kept trying play and after a few days of getting to play for more than 10 minutes on and off, it never happened again. But I did absolutely nothing.
Enter Star Wars Battlefront Beta and Fallout 4.
I am now having the same exact issue with these two games (well now the beta is over). Through some more searching the interwebs and help from my dad, I decided to just get a new power supply entirely. It made sense, because we bought the computer from a guy a few years ago (almost 4 I think?), and at the time I was only running it with the built in graphics card. So I figured the power supply was getting old, and maybe it couldn't support the GTX 750 I have in it now.
But before I did that, I thought I might check what the current supply wattage is. So I open my case and take out the supply, and I am looking all around it for any information. Turns out, there wasn't any stickers or anything with any information. But while I was there, I decided to give my computer a nice cleaning.
After I finished that, and put everything back together. The end result, my computer can't even do normal tasks now.
It would shut down within about 5 minutes of starting up, even when I did absolutely nothing.
So, I said screw it and bought a new Thermaltake 430W and installed it. With eyes gleaming and nerves high, I turned on my computer, waited for all the startup programs to do their thing, and....crash.
Over an hour of time, I just kept turning it on and trying to do things, sometimes with more luck than others. The best of being gets 30% through the download of Fallout 4. The worst being shutting down while waiting for Firefox to load.
Now, it has steadied for about 30 minutes as I checked my email and wrote this message. I am going to try Fallout once more, and then I am done for the day.
So I thought I'd drop a message here, in case anyone had any brilliant ideas. Some other possible culprits I have read about, and will investigate further, include the following:
Thanks in advance for any help!