Hi, I was wondering if anyone knew it they make a connector to convert an lcd cable to a dvi input. I have a Sony 19 inch widescreen monitor and it only has an lcd output and I'm trying to see it it would run on my 7800 with dvi inputs.. thanks

I'm not sure what "lcd output" means exactly. Obviously you don't mean dvi or else you wouldn't have a problem. Also, your monitor has inputs and your graphics card has outputs, not the other way around like you wrote. What kind of connector is on your monitor? Vga?
If it looks like this it's vga:
http://public.online.ksu.edu/support/kyc/images/desktop/vga.jpg
Just buy a vga/dvi adaptor, you can find them most everywhere that sells computer accessories.
Otherwise, post more info about what type of connector your lcd has.