What is strange is the fact that both of the prohibited the use of these behind it. It went OK the moment they changed places. I'll try your suggestion. Did you also know that when one type something wrong, one can select the word and holding the control key one get a list of words to choose from? Paul Moortgat On 08 Mar 2012, at 14:54, Robert Ashton wrote: > Try cleaning the ram contacts (where the ram goes into the ram socket) using a pencil eraser. Eraser should be soft and not gone hard. What happens is over time there will be oxidation build up thus causing a poor contact. As you do this you will notice a change in the color of the contacts. If it is third party ram it could be under warranty as none apple ram can have lifetime warranty. Hope this helps. Email me if you have any questions. Bob > On 2012-03-08, at 3:38 AM, Paul Moortgat wrote: > >> I got 2 GB ram when I bought the Mac Pro. I added 4 sticks of 2 GB to get 10 GB. >> I now suddenly found out that I had only 4 left in the second Riser. >> I opened the Mac and moved the 2 1 GB sticks from Apple to place 3 and 4 of Riser A. >> I moved the 2 2 GB sticks from 3 and 4 to 1 and 2 and now I've 8 GB ram. >> The 2 1 GB sticks from Apple show empty in the System Profiler. >> I'll remove them later. The Mac is out of warranty. >> >> Paul Moortgat