Dell Power Edge 2950 upgrade from 4Gig to 32 Gig - says no memory

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http://serverfault.com – I removed the original 4 x 1Gig memory from our 2950 Power Edge Dell server (we have 2 Xeon quadcore processors) I added 8 x 4Gig RAM When booting, the server gives a message saying no memory and boot abort. Also the message "Intrusion" comes at times. When I put back the original 4 x 1 Gig, it works well. What can be the problem? (HowTos)