No video signal on a HPE 510f with a GeForce GT 640 connected to a HD TV

After upgrading the video card in my HPE 510f to a GeForce GT 640 and re-connecting it to my Home Theater system, there is no video signal from the HPE 510f when I switch the video input on the TV. Simply unlpugging and re-inserting the HDMI cable solves the problem, but there must be something else that can be done. This solution kind'a defeats the purpose of having a remote...
Does anyone have any ideas?

Hi,
Review this HP posted article for setting up dual monitors. Look at the troubleshooting section for TVs.
Use a quality HDMI cable that is certified for 1.3 or 1.4 if the TV is 3D.
Avoid using adapters as they can be another point of failure.
Avoid using a long HDMI cable as the length can at times be an issue. 15 feet or less should be OK.
Try the latest NVIDIA Driver from the NVIDIA site. Review the release notes.
Check the bios level of your PC against the latest bios level posted by HP.
Unless you have upgraded the power supply in the HPE 510f, the 300 watt PSU is below the GT 640 minimum requirements of 350 watts.
HP DV9700, t9300, Nvidia 8600, 4GB, Crucial C300 128GB SSD
HP Photosmart Premium C309G, HP Photosmart 6520
HP Touchpad, HP Chromebook 11
Custom i7-4770k,Z-87, 8GB, Vertex 3 SSD, Samsung EVO SSD, Corsair HX650,GTX 760
Custom i7-4790k,Z-97, 16GB, Vertex 3 SSD, Plextor M.2 SSD, Samsung EVO SSD, Corsair HX650, GTX 660TI
Windows 7/8 UEFI/Legacy mode, MBR/GPT

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