Symptom
Apple System Profiler may show some memory slots as empty even though the slot contains memory.
Solution
Whenever possible, visually inspect the memory slots on the computer to determine which slots are actually filled. Make sure that the RAM is firmly inserted in the slot.
If ASP detects and displays the memory when it is installed in a different computer, the original computer may require a different kind of memory. To find out what kind of memory your computer uses, search the Knowledge Base.
If the memory does not work in any computer, it may not meet specifications or could be defective. Contact your memory vendor or supplier for additional information.