Mac Pro loss of RAM

[pideja]

For some time now, my MacPro has seemed sluggish and slow. Running Tech Tools Pro, I noticed that it listed 2Go of RAM...but I installed 10Go RAM when I purchased the unit, five years ago. What could explain the missing RAM?

 

[simsaladimbamba]

What does System Report / System Information > Hardware > Memory have to say?

 

[Tesselator]

Remove all the DIMMs and riser boards, clean all the connections with a pink pencil eraser and rubbing alcohol, reassemble and test. You might have to reseat the riser boards a few times - I have had to on mine in the past.

 

[GermanyChris]

Check under your desk to see if the rest is hiding from you! I tend to find mine on the left corner behind my lamp. Gibe the DIMMS a pat and scratch them behind the ears and put them back in.

 

[Spacedust]

Probably dead RAM - this is typical for Mac Pro 2006-2008