Monitor input lag?

[Nickodeamous]

Hi there,

I recently hooked up my MSI gaming laptop to a 24 inch monitor and I noticed that almost immediately, there is lag input lag and that when I move my toon left or right, it seems to be a split second slow. Its actually really bad as it is giving me a headache...I move left on the keyboard and in my mind, it should move the camera left, but it takes longer than it should, and has become unplayable.

Does anybody know what this is and can it be fixed through the settings?

edit: my wife says the monitor is like 7 years old, so its probably the cheapest 24 they had.

Thanks for the help!
Nico