Changing old CRT MONITOR for a 24" LCD on old computer so as not to blow the grapics card should I do anything to the old computer before installing new LCD screen meaning changing the screen resolution
You computer will take a performance hit when you up the res, but thats about all.
Nothing will die unless the hardware is faulty.
So if it ends up not playing well on the new monitor will then will have to get a new graphics card.
OR you could list your graphics card and the monitor your thinking of getting also what games you play.
Then we will be able to tell you if your graphics card can handle the higher res.