My monitor will say its going to sleep, the keyboard and mouse will stop working but the tower itself will not go to sleep. When it does that I am unable to the monitor, keyboard, or mouse to come back on so I am forced to hard restart my computer. I do remember having a video card error message come up before this issue began. I did go onto the manufacturer's website and do the upgrade but it still does it. Is this my Video card going out? Help!?