HT1423 My imac G5 only recognizes one slot after installing 2x2 GB ram

My mac is a early 2009 model running 10.7 software. I realized it was running pretty slow so i decided to upgrade the ram from 2GB to 4GB. After installing it, i checked my memory and it recognizes one slot and not the other.

I swapped them and it showed that the other slot did not recognize it either.
Its the correct RAM for my computer, I contacted the seller and hopefully they would send me another. Thank you!

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