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I have a feeling that you have not installed the drivers for the card, hence you cannot use the higher resolutions. Install the driver from the CD provided and then you will have access to all resolutions.Download the driver from if you donot have the cd.
Go to System, on the top bar, then Preferences and select Monitors. On the Monitor Preference screen there will be different resolution settings that you can choose. If there are any resolution settings higher than 800X600 like 1024X768 etc. select it and apply.
If there is no other settings available go to System then Administration and select Additional driver. When the Additional drivers screen appears check if it recommends a a driver to be downloaded. If it does, download the driver and then you will be able to get higher screen resolutions.
If there is no additional driver to download it gets a bit tricky. You will need to edit your /etc/X11/xorg.conf file. The file will look someting like this:
It will be wise to make a backup of this file if you are going to edit it. (xorg.conf.old) Inside the file you will see your screen and its resolution. (Preferred mode) You need to change the resolution, save the file and restart your session. If all went well your resolution will be set to what you specified, if your display freaks out replace the xorg.conf file with the xorg.conf.old file.
This sounds familiar. What you need to do is download the motherboard INF setup or the motherboard drivers as they are sometimes called. Run that and windows will then be able to identify the hardware. At that point you can run the video driver and it should now install. When it is running you can change the screen resolution to higher as well as the colours to higher.
As a word of caution sometimes the drivers that you download from the manufactuers website won't work for the first install but the ones on the cd will.
I have the Ubuntu installed on the machine , It does show NVIDIA driver installed in the list. I had to install the NVIDIA driver because of the UBUNTU installation didn't show the higher resolutions on my computer. I needed to download the NVIDIA driver installtion file from the internet and that made my computer work for better resolutions as my computer hardware supports.
try resolution change or refresh rate look in system files i know linux is hard the first time unbuntu forums .com helped me a lot a lot of questions answered there just trying to help with some sites i used without typing answers and don't want to confuse you