MEMORY CLEANER CNET MAC OS XAs with many other Mac OS X troubleshooting techniques, its often easier to throw multiple relatively harmless solutions at the problem of repeated panics in the hopes that one or more will stick. Problematic RAM modules constitute a primary cause of kernel panics that occur in a seemingly random fashion. If you have kernel panics that don't seem to be specific to any device, application or intensive CPU activity, you may have bad RAM. You can sometimes determine if you have a "bad" RAM module by using the Apple Hardware Diagnostic CD, included with all currently shipping Macintosh models. To use the Apple Hardware Test CD, restart your computer while holding down the C key until the "Loading." icon appears. MEMORY CLEANER CNET INSTALLOn other Macs, a hardware test can be performed by inserting the Mac OS X Install CD and holding down the "D" key while the system is starting up. Apple says "Please connect the mouse to a USB keyboard." Note that the Apple Hardware Test cannot be used when a mouse is directly connected to the USB port on the display or on the iBook. If the Apple Hardware Test does not show any errors and you are still having problems, you may want to try removing each RAM module one-by-one and checking for persistence of the kernel panics.Īlso, not that different iterations of Mac OS X or updated firmware can prove more temperamental with some RAM modules than the previously installed software/firmware revision. In other words, an OS or firmware update can introduce kernel incompatibilities (and panics) with hardware, including RAM.īad NVRAM NVRAM consists of a small amount of memory dedicated to storing important settings for the way Mac OS X interacts with hardware components. For instance, one NVRAM variable tells the system how much primary RAM to recognize. These settings can sometimes become correct or otherwise problematic, occasionally resulting in a kernel panic. As such, clearing NVRAM can prove a quick fix when the cause of random kernel panics or particularly kernel panics at startup proves elusive.
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