So i've gotten PC Skyrim fairly recently and it has played perfectly fine on Ultra settings. Over the past 3 days i've gotten into modding it with Nexus mods and everything has been fine up until today when it just shut down my computer. I was playing Skyrim for maybe 45 minutes to an hour and out of nowhere, my computer just shut off while playing and I had to completely restart my computer. Is this some sort of overheating problem that is causing this or some other type of problem? I don't necessarily think it was an overheating problem because I felt the back of my computer and it was semi warm, not burning hot. So does anybody have any advice on how I can prevent this?