My model : Samsung SyncMaster 940bw After change of setting, I am getting images which are not clear and crisp and having less colour content

Good Morning!
One thing that I have noticed when I change settings on my monitor is that sometimes it needs to be re-aligned. Thankfully this is very easy to do. There is a button on the bottom right of the screen that says "Auto".
Press this button and you should see the screen shift and become sharper.
If this does not work, you may want to change the monitor back to the default settings. You can do this by navigating through the menu: Press the Menu Button -> Select "Setup" from the on-screen menu -> And then separately select "Image Reset" and "Color Reset".
Please feel free to comment back if this does not solve your problem.
Thanks!