monitor scrammbled but TV works

[Theorbit]

everything was working fine, I could view my Dell computer monitor and see the CDG music on the TV. But I decided to try something different and now I can't see the Dell Monitor, it's as if the picture is overlayed on itself and off the screen 50%. Here's what I did. I was curious if I could start my computer without the computer monitor connected, so I turned on the computer with only the TV connected. When I did this the computer went through a long boot up (like it was changing settings). All seemed normal, but I didn't like the resolution I was getting on just the TV. (I was trying to see if Windows looked as good on the TV as it did on the monitor). So I turned off the computer and put my connections back to normal. When I turned on the computer I got this scrambled version on my monitor. I checked the forum and tried some of the things I read. I tried going to settings and setting the display for dual monitors but there is only 1 monitor to click on, not 2 like there used to be. So I did a ''restore to a previous date', and that made my monitor work correctly, but my TV won't work at all. And worse, I loose some of my files that I had saved. So I restored back to the other way and await your advise. I bought my computer from MTU preinstalled with Hoster. It has the two 80 gig hard drives in a Shuttle X case. (Administrator note: my system ID: is N4102101GA3TH0 if this helps you find what is in my system)
Any suggestions on how I can change my settings back to where they were?