Ubuntu: Setting Up High-Res Monitor


I have a desktop computer with Ubuntu 16.04 LTS, and an NVidia GEForce 630 4Gig graphics card. I was running a monitor at 1900x1200, and just bought a new one that should do 2560x1440. However, I can't get that higher resolution to work. With HDMI or VGA cables, the highest resolution offered is 1900x1080. I've tried increasing it manually with xrandr, with no luck (I get a BadMatch error).

With a DVI cable, it seems as though it wants to come up at the higher resolution, but the colors are all green and very washed out when it first starts. After a few seconds, it just goes to black.

Any help would be greatly appreciated.

Thanks in advance,


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