RE: Dell P2314H LCD conditioning doesn't seem to work
LCD conditioning only helps reduce minor cases of image retention. It has nothing to do with video lag. Video lag is either your internet connection or the video card display settings or driver.
* Press the P2314H Menu button
* Go to Other Settings
* Go to Factory Reset- Reset All Settings
* The bottom of the Menu should state Resolution: 1920 x 1080, 60Hz
* Exit the Menu
* Go back into the Menu- Other Settings- LCD Conditioning- Enable. What happens?
You need to test a HD video that resides on your computer, not the internet.
If the video card has both DP out and DVI out, test them both on the P2314H.