On 8/19/10, John Gilbert <gilbert2330 at earthlink.net> wrote: > > My G4 has given me about two years of faithful service until recently. > Beginning about a week ago, it began crashing, giving me a black screen > message stating I needed to hold the restart button, turning it off. Then > restart. > > Before last week, this had never happened. In the past week, > it has occurred wayyy too frequently, almost three or four times a day. > > Is my power supply going? Could there be another reason? Start with these: "What is a kernel panic" <http://support.apple.com/kb/HT1392>, "Technical Note TN2063: Understanding and Debugging Kernel Panics"<http://developer.apple.com/technotes/tn2002/tn2063.html>, "Mac OS X Kernel Panic FAQ" <http://www.index-site.com/kernelpanic.html>, "Resolving Kernel Panics" <http://www.thexlab.com/faqs/kernelpanics.html>, and "Tutorial: Avoiding and eliminating Kernel panics" <http://www.macfixit.com/article.php?story=20060911080447777> for more details.