OS Install Mode
One of my techs ran across this the other day. Check your BIOS setting for something called a “OS Install Mode”. Make sure it is disabled. When enabled the system will only recognize 256MB of ram. Older operating systems had a limit on how much ram they could recognize for installation.
http://support.ap.dell.com/support/edocs/systems/dim4600c/sm/syssetup.htm
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