[ubuntu] Memory upgrade for an older computer and a video problem

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http://ubuntuforums.org – Hi. I have a computer that my friend was throwing out since she got a new one from work. I am a long time Windows user, but I thought I'd give Linux a try as a hobby using this computer. Everything is basically working fine with Ubuntu 12.10 installed. The only problem I have is that the login screen displays the message "Input Not Supported" on a small screen that bounces around within the big screen. Once I log in the little screen goes away. The computer is an HP Compaq Presario SR5030NX with an Acer monitor. The computer has 1.5 GB of memory and I'd like to upgrade it (Hardware)