My G4 MDD (the FireWire 800 model with dual 1.25GHz CPUs) doesn't recognize all of its RAM. It has 4 512MB sticks installed but About This Mac only shows 1.75GB. I even pulled and reinstalled all the RAM. Could it be some kind of software issue? I'm running OS X 10.4.11.
It doesn't seem like bad RAM to me, because why would half a RAM stick be working and the other half not? I notice DIMM 2 shows up under System Profiler as being only 256MB, but it's clearly marked 512MB.
Edited by itsvince725, 28 December 2016 - 10:36 PM.