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DVI Detective Plus with EDID storage for HDTVs is the fastest and easiest way to diagnose problems, or simply solve the case of the missing EDID.
If you are having trouble switching from source to source on your HDTV it might be because your display is losing the EDID, or the electronic identification that tells your display vital information about what resolutions and frequencies should be employed.
The DVI Detective is hooked up in between cable runs to basically tricking your source devices into thinking that the display is hooked up, retaining the EDID and making switching flawless.