NEC MultiSync XP21 Display Problem (Convergence??)

There is a problem in the top and bottom thirds of my monitor. They are really blury and on the top right and bottom left sides there is a pure blue strip while the top left and bottom right are pure green stips. I thought it had to do with convergence of the guns so i opened my monitor up and fidled with 5 switches. they didn't do much to help... they didn't help the problem at all actually but when i tried to put the cover on these adjustments it altered the problem. Now where it was green it is red and yellow strip and blury. Is there a way (other then always hitting the board part) to get it to permanently stay focused? Where does the problem rest and what can i do to fix it?