Does your monitor have any advanced features like speakers and a place for optional 
plug-ins for things like mice and keyboard? Can you remove the new monitor and go 
back to the original working state? Have you tried checking for different or updated 
monitor drivers? See what your system lists for it's monitor driver. If it is generic 
, standard, system or something like that, I doubt that changed anything. Have you 
tried to 'Roll back the keyboard and mouse driver to it's previous ver.?

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