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You might try cycling through your video modes. On a Dell, for example, there is a blue Fn key near the Ctrl key. Fn+F5 will cycle through:
LCD only
LCD+monitor output
monitor output only
The video card may be having a tough time sending video to both lcd and monitor. Try just monitor output and see how that goes.
LCD only
LCD+monitor output
monitor output only
The video card may be having a tough time sending video to both lcd and monitor. Try just monitor output and see how that goes.
