Frequently when my Mac crashes (2-5 times daily), what appears to be code will appear in the upper left hand side of the screen (maybe 2 out of 5 times). It will say things like: system failure: cpu- 0 Code- 000000001 Corrupt stack Latest crash info for CPU Exception state SV=0x172380 PC- 0600092054; msr=0x00001030; tar= 0x0fb4bb98; tsisr=0x40000000; lr=0x000023 Any idea what the problem might be or how I could correct it? I'm not sure if this is helpful but this system would ONLY lode on my back up drive. It crashed every time I tried to load it on my primary drive. I took it to the Apple store and they ran some tests and said the hardware was ok. Any suggestions would be greatly appreciated.

Boot from OS 9 and run Disk First Aid on all your drives. Fix any problems encountered, and once you can't fix anything else buy DiskWarrior and run that until it no longer finds any problems. Then restart into OS X and run Disk Utility to repair your permissions. Then see if it stops crashing... p

Thanks. I'll try that. Todd

Hi there... I get a similar (or the same?) crash, but I think it has to do with an internal DVD upgradee I did. Did you reconfiger your mac's hardware somehow? I have a PowerMac G4 (Quicksilver) 733, running OS X 10.2.6, 896 RAM The problem started after I replaced the internal CD-RW with a Pioneer DVD-R A105 drive. The drive works fine, but I get this horrible crash and screen dump once a while. I've tried re-installing the system and testing/defragmenting/reformatting multiple bootup drives (including with OS 9 as suggested), but none of that helped. Here's some of the error message I get (the hex codes are not all there). Note references to DVD and IO protocols. System Failure: cpu=0; code=0000001 (Corrupt stack) Latest crash info for cpu0: Exception state (sv=0x1CF12500) PC=0x0009272C; MSR=0x0001030; DAR=ox1504FFFC; DSISR= .; LR= ; R1= ; XCP= (System Failure) Backtrace: backtrace terminated – frame not mapped or invalid: 0x1584FF00 Proceeding back via exception chain: Exception state (sv=ox1CF12500) PC=0x00258EF4; MSR= ; DAR= ; DSISR= ; LR= ; R1= ; XCP= (0x300 – Data access) Backtrace: . backtrace continues Kernel loadable modules in backtrace (with dependencies): com.apple.iokit.IOSCSIMultimediaCommandsDevice(1.2.0)@0x1deef000 dependency: com.apple.iokit.IODVDStorageFamily(1.2)@0x1de2a000 dependency: com.apple.iokit.IOSCSIBlockCommandsDevice(1.2.0)@0x1ddc7000 dependency: com.apple.iokit.IOCDStorageFamily(1.2)@0x1dd3f000 dependency: com.apple.iokit.IOSCSIArchitectureModelFamily dependency: com.apple.iokit.IOStorageFamily com.apple.iokit.IOATAPIProtocolTransport(1.1.1)@0x1daaa000 dependency: . Etc.

did you get any suggestions... i have the same problem!