PM G4 FW800 RAM slots playing up

[Markeh21]

FW800 single 1Ghz, if the third slot is the only populated one then it works fine. The third slot won't work if anything else is populated. The sticks are 2 512s and 2 256s and work fine in my other dual 867 MDD. Any ideas to attempt to fix this?

 

[Willis]

FW800 single 1Ghz, if the third slot is the only populated one then it works fine. The third slot won't work if anything else is populated. The sticks are 2 512s and 2 256s and work fine in my other dual 867 MDD. Any ideas to attempt to fix this?

Have a feeling your MLB/dimm slot is at fault when handling multiple dimms.

Is the machine dusty inside? Have you tried using compressed air to clear the inside?

 

[Markeh21]

Suspect it was dust, blew it all out and put the RAM in 1 by 1 starting from slot 1 onwards, booting, checking About This Mac, shutting down, add another stick and it now works fine.