Apple iMac (Mid 2006) - Manual (Page 65)

Chapter 4 Installing Memory 65
Making Sure Your iMac Recognizes the New Memory
After installing memory, check whether the computer recognizes the new memory.
To check the memory installed in your iMac:
1 Start up your iMac.
2 When you see the Mac OS desktop, choose Apple () > About This Mac.
For a detailed breakdown of the memory installed in your iMac, open System Profiler
by clicking More Info and then Memory.
If your iMac doesn’t recognize the memory or it doesn’t start up correctly, shut it down
and check the installation instructions again to make sure that the memory is
compatible with your iMac and that it is installed correctly. If you still have problems,
remove the memory and consult the support information that came with the memory
or contact the vendor who provided the memory.