I have a rather curious problem with my Mac Pro (running 10.4.10) - it won't run PowerPC apps. They just don't open anymore, they'll bounce in the dock and disappear. No error or anything. I'm sure it's due to them not being UBs, as when I check "Run in Rosetta" for any program it fails to open. I installed RAM recently, but removing it has done nothing. I'm not sure how long these problems have been around for, as my Mac has had several bad runs in the last couple months and I can't be sure when this specific problem started. Any suggestions as to what to do here?