Hello, i have a Asus F5R with Preloaded Windows Vista Home Premium, it came with 1gb ddr2 ram and recently installed another 2gb of same type ram. When i look into the bios it only shows up with 2gb when it should be showing 3gb.
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Look into the System Properties in Control Panel. How much RAM do you see there ?
Your notebook may have support for only 2 GB memory.