Memory mystery w install

I have a PowerMac G4, running 768 memory. I recently upgraded due to satellite installation. I first added new memory of 512k (total was 1024), then tried to install Tiger. Install would hang up at 32% with strange messages (white lettering on black, that ran across the screen) including "cannot connect, back trace, panic - we're hanging here". Disconnected all devices, finally erased hard drive and tried again and again. Same problem. I finally swapped out the 512 and put back a 256. All is working well. The 512 showed up as working before I tried installation. It works fine on my older imac (running 10.2). I bought it for the G4, but am now afraid to put it back in. Anybody? What gives!

Specs should be in your computer's user guide. If you don't have one you can get the information from the EveryMac site. Alternatively, go to Apple's support site, click on the Manuals link and locate the user guide PDF for your model.
I buy my RAM from DataMem. I've been getting RAM from them for nearly 19 years with complete satisfaction.
When you install the DIMM be sure to first clean the contacts using a clean pencil eraser. Then be sure you get it properly seated in its socket. You may also try switching its position with one of the other modules as a test of the socket itself.

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