No Source Signal, intermittently when using Graphics Cars

I've just bought a new HP 23xi monitor and am very happy with it, aside from one thing.
When I connect my Graphics Card to the monitor (with HDMI, DVI or VGA) 95% of the time I will be presented with the message 'No Source Signal'. After some unplugging replugging, the monitor will normally display the image.
If I connect the monitor to the VGA or HDMI port on my motherboard however, it will work first time everytime. I've checked and the issue is not with my graphics card as it works with other monitors just fine and was working only minutes before I changed to this monitor.
Has anyone encountered something similar? If so, please do say how you fixed it. I'm leaning towards a software issue or some form of incompatability between my monitor and graphics (if sucha thing even exists)
Many thanks for any input.

Hmm are you using the graphic card driver from Toshiba driver page?
Such driver is a little bit different from other original nVidia drivers because its modified for mobile usage. It contains some kind of overheating protection.
In case of higher GPU temperature, such driver would clock down the GPU performance in order to increase the GPU temp.

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No Source Signal, intermitte​ntly when using Graphics Cars

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