I had this problem with a 2001FP when it was hooked to my system. Apparently, it's a known problem. Dell has a utility that will fix the firmware issue. I can confirm that it works.
Click here
You have to email Dell support to request the utility that will fix it. Why they don't post it on their site is beyond me. There used to be
another site that had the file, but it looks like it's no longer there. I'd send it to you myself, but I don't have the file any more - I ended up staying with my CRT and returning the 2001FP.