Ive been having an intermittent issue with my Macbook Pro. My Macbook Pro is always connected to a power source and also an external monitor. The monitor is an 23" Apple Cinema Display, connected via DVI through a DVI-Mini Display Port adapter.
These dots start appearing on both the internal display, and the external display. Shortly there after, the Macbook will stop responding to keyboard input and mouse clicks, but the mouse will still move. After that the mouse will stop moving and then I will have to hard reboot the system. After I reboot everything is back to normal.
Is this a common problem? Has anyone seen this before?
System Info:
These dots start appearing on both the internal display, and the external display. Shortly there after, the Macbook will stop responding to keyboard input and mouse clicks, but the mouse will still move. After that the mouse will stop moving and then I will have to hard reboot the system. After I reboot everything is back to normal.
Is this a common problem? Has anyone seen this before?

System Info:

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