This has happened several times over the past couple days. I will be playing DC Universe Online and my Windows 7 x64 PC simply and abruptly shuts down. Not blue screen, nothing just power off. I have had the system for years and never seen this happen under other circumstances. I don't know how to figure this out at all. I don't know where to look and I don't even know if it is a hardware or software problem.
Any help is appreciated.