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Message: <blockquote data-quote="jchukwum" data-source="post: 734576" data-attributes="member: 69241">Hi,I'm new to this group and wonder if you can help me. I have a Power Mac G5 running OS X 10.5.5 (9F33) and my memory is 5.5 GB.The curious thing that happens is when I start up my Mac I see my Active Memory usage begin to creep up in the Activity Monitor until it gets to about 3.6 GB. This is weird because I don't have anything interesting running in the background (I've checked in my Login Items). When I try to sum up the Real Memory column in the Activity Monitor it's around 1.5 GB - so where is the rest.So now my Mac is almost limping because I only have 1 GB left (the remaining 9 MB are being used in Wired memory) and when I actually want to use apps like Safari, Aperture et al my Mac begins to struggle. And sometimes the funny this happens, I get an error that says that my Startup disk is almost full.I have 35 GB available when I start and when I get this error and look again I see that I have like 18 GB. ***!My only guess is that some app is munching my memory and the mds begins to do something (I hear the disk being read/written) and my disk gets filled up.  I can't find any one app causing this problem because I have nothing open and the Activity Monitor doesn't show me any culprit.(Sorry for the long winded message I wanted to make sure I capture everything)Please help.</blockquote>