Sorry if this is not the right section to post this problem in , but I'm not even sure about what's the problem..
Basically this started a few days ago, happened 3 times so far. Everything is working fine , I haven't experienced any fps drops or anything like that. I was playing CS:GO and HoN (Heroes of Newerth) , I tabbed out to desktop and when I tabbed back I could see the game but it suddenly froze and no matter what key combinations I used nothing happened at all, had to reboot, then everything went back to normal. The second time, I started HoN and it stuck on the loading screen and froze there, let it stay like that for minutes and nothing happened.
What could be causing this? I haven't experienced anything like this before. My HDD is pretty old compared to the rest of my components about 5-6 years old, could this be HDD failure? Thanks in advance.