[ubuntu] New to Ubuntu and computer building- monitor issues.

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http://ubuntuforums.org – I just built my first pc and installed Ubuntu 9.04. I have 2 monitors (17" HP and 22" Hanss-G). I can't get both of them to run at the same time. If they are both plugged in then the one on the vga port (HP) shows up but the other one won't (DVI). The one on the dvi port (Hanns-G) will work if it's the only one plugged in but even then the screen flashes black erratically. I did an update yesterday and now when I minimize a window, a ghost is left behind. Also the nvidia x server settings window won't let me set either monitor to it's native resolution but it does recognize both monitors but only shows an image on the one. Sorry if this is confusing. I'm new at this and didn't realize it would be this difficult. thanks in advance Joshua (Hardware)