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I have a Dell PowerEdge 800 running, with 4 1GB RAM modules installed, totaling 4GB. But while doing POST, it displays a message saying "Amount of Memory Limited to 256MB" and checking System Monitor in Ubuntu (Ubuntu Jaunty Jackalope) the OS also reports 256MB in total.

What might be the problem?

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migrated from stackoverflow.com Jun 1 '11 at 16:32

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everytime, you should google first. –  nXqd Jun 1 '11 at 18:41

2 Answers 2

This is on the Dell forums:

In the BIOS disable "OS Install Mode"

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Pull the CMOS battery on the system board while the server power cord is unplugged. This worked for me in a PE1650 with the exact same issue, not 100% it will work for this system but worth a try.

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