Monitor Won't Wake Up When Coming Back From Sleep - Windows 7

I recently upgraded my dell dimension desktop to windows 7. In order to do so, i had to install a new grapchis card (nvidia geforce). I set the pc to sleep after a period of time. When i go to move the mouse and wake the computer back up, the pc itself seems to respond, but the monitor never comes back from sleep. I have no choice but to reboot to get the monitor back. Any suggestions?

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