I have a Inspiron 545 and a ST2210 monitor. A few months ago the preset mode buttons on the bottom right hand side of the screen started to appear automatically and the screen would adjust itself non-stop. Pressing the buttons manually would cease the problem for a while. I also bought an air duster spray and this seemed to work for a bit but now either options work.
In fact the problem has worsened in so much the the automatic adjustment is constant and I can't manually turn the monitor off using the on-off button, I have to physically disconnect the power cable. The only changes since buying the computer a year ago is that I have upgraded to Windows 7 and I moved a month ago, although the problem started prior to the move but has worsened since.
Any advice would be much appreciated as this problem is really annoying me!