So I recently got my hands on an iMac G4 700mhz machine. Very nice computer. However ever since I have got it I've been having issues with the ram, more specifically, the fact that the computer doesn't want to address all of the ram installed. I've done extensive troubleshooting on this machine from installing different operating systems to trying all possible combinations I could do with the SDRAM chips I have and to no avail. I ran apple hardware test which reported a memory error of post/16/2048 but when I ran a quick and extended memory test they both came back with a pass. On top of this Apple Hardware Test does detect the actual full capacity of the installed DIMMS. I've attached pictures of this to the post. It is also important to note that in both os9 and os x the chips are identified as PC-100 when in fact they are PC-133 chips. Despite the computer reporting these ram errors I haven't actually had any problems with the machine. No Kernel panics or crashes or anything which just makes things even more confusing to me. I have also tested some of the ram chips in my iMac G3 and Apple Hardware Test hasn't returned any issues (I could only test the full sized ram chips though since I don't have a powerbook or ibook machine to test the laptop sized dimms) The only other theory I really have is that it has something to do with the firmware. I booted the machine into openfirmware and it says it's running version 4.3.5 (or 4.3.5f1 as it says) built on 03/16/02 at 21:45:18 I've tried researching this version of the firmware but I haven't been able to dig up much on the internet about it. If anyone knows anything about this particular version of the firmware, if this version causes any issues and if there are any firmware updates for the iMac G4 available then that would be much appreciated. I'd love to get this all sorted out properly since I want to try bump the ram to 1 gig at some point when I get round to finding some 512mb chips. Thanks in advance!