G4 Titanium memory install but slot shows empty

Just installed 2 512 dims into my G$ Titanium but it only recognizes one. The bottom slots shows 512 MB but the top shows the slot as empty. Reinstalled again but still the same. Tried my old 256 MB in the upper slot and still empty. What could I be doing wrong? this upper slot has never been used.
G4 Titanium, 500mhz, OS 10.3.9

Hi F,
If the RAM is correctly installed/seated, it sounds like you have a bad upper slot. Like any electronic part, it can just fail for unknown reasons.
Just to make sure, I would try just the original 256 in the upper slot (nothing in the lower slot), and also try one of the 512 DIMMs in the upper slot with nothing in the lower slot. It has been reported here that incompatible or faulty RAM can work in one slot but cause the other slot not to be recognized. It's not as likely, but if this is the cause, return the RAM for compatible RAM or a refund. If it turns out to be the slot, then you'll have to run on 512MB, as replacing the RAM slot means replacing the logic board, which would likely be cost prohibitive on a machine of that vintage.

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