Now for example, lets say that you're playing some horribly coded console port, GTA IV: The Lost and Damned and for one reason or another, at some random moment it completely locks up your whole system. Lets say that this isn't hardware related in any way, lets say that your whole system has been brought to an endless loop by the sheer shittiness of a badly coded, badly optimized game. What can you do exactly when that happens except of a hard reset? How can you kill a messed up process when your keyboard and mouse aren't responding?
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Hard reset is the only thing to do. When a PC freezes it stops accepting inputs.