Won't recognize new RAM card

system profiler says I have:

Size: 256 MB

Type: DDR SDRAM

Speed: PC2700U-25330

Status: OK

I want to swap it with a:

1GB

DDR SDRAM

PC2100U-25330

when i do the swap and restart, profiler says the slot is empty. The 1GB card came from another machine which does recognize it. Why doesn't it work?

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The earlier G4 PowerBooks used PC2100 RAM. You are trying to move RAM from a earlier machine to a later one that uses PC2700 RAM. If you want specifics please give the last three letters of your serial numbers and I'll give you links to both machines.

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