I have an imac 2009.I've recently upgraded the ram to 2gigs each bank.But my mac can't seem to recognize on of them. It shows up nil. But still recognizes the original Ramm

I have recently upgraded the ram on my imac leopard from 2gigs to 4gigs. One bank works fine and shows 2 but the other shows nil but not when i put back the orginal  1 gig ram.It shows up as 1.
Whats going on and what t casn be done to rectify.?

Hi Ralph,
I can't say that these examples meet your question entirely, it's late and I haven't time to go through them, but it does seem in part to meet your enquiry.   Hopefully it will help.
Activity Monitor not showing all RAM: Apple Support Communities
iMac RAM upgrade madness: Apple Support Communities

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