Mac Hardware Details - specifically iMac
I'll just assume you're talking about an iMac. Maybe this is what you're looking for?
iMac 20" Teardown
This might answer it. Disassembled iMac
I'll just assume you're talking about an iMac. Maybe this is what you're looking for?
iMac 20" Teardown
This might answer it. Disassembled iMac