You can do this by shutting off the machine, and then holding in the power button for 5-10 seconds, until you hear a loud tone. I would try resetting the PMU before doing a PRAM reset. Also, make sure the modules are of the same specs, because often the machine will reject one module if the two are different. Make sure the RAM is correct for the machine - a 1.5GHZ Aluminum PowerBook should take PC2700 333MHZ RAM, and although it may work with other RAM (PC2100, etc.) the machine will not perform optimally. Be happy that both slots are non-functional, because that happens too! :-) Just to verify this is the issue, I would try the memory that you have gotten working in the bad slot, in case the module you previously put in the slot was bad, or the wrong type. Unfortunately the RAM slot issue is a hardware problem which has to do with these older PowerBooks slowly developing defects over time, and there's no fix.
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