Monitor freeze CPU or graphics card

I have a Dell 630i with a Quadro FX 3800 graphics card. When I'm running a program like Illustrator or Premiere and I step away from the PC for a while, when I come back the monitor is frozen and the only way to remedy it is to do a hard reboot with the power switch. I have a dual quad core Q8200 processor running Windows 7 64 bit. Any ideas?
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More about monitor freeze graphics card
  1. Probably the card.
  2. Do you have the most recent drivers for the card?
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