gp 3000 problems

I'm a bit new to crt projectors in general and this is my first post so please bear with me on this one. I have an NEC GP3000 in my dorm room for all sorts of fun. Attached to it by rgb is a computer. I understand that the projector is supposed to be capable of 1024x768. I cannot run anything through the projector at more than 640x480. At 800x600, I get a picture, along with the "NO INPUT, CHECK INPUT LIST" message. Also, I can't do point convergence at this resolution. I can use the static convergence feature but I can't actually get a grid to converge it, therefore making it essentially useless. At 1024x768, it simply detects no input. That is my laundry list of problems with the RGB input. The svideo is also sort of useless for several reasons. First, there is always a significant amount of noise in the top 3/16th of the screen or so. On top of that, every 3 or so seconds, the projector flashes out of convergence for a second or so, eliminating any potential to watch anything using the svideo input. If anybody has any suggests regarding how to solve any of the many problems, it would be much appreciated. I've played with just about all of the settings that are controllable via the remotes but have had no luck. Hopefully somebody else has had more experience with this particular model than I have.