Rolling back the Linux kernel can save the day when a bad update breaks your system. It should be done carefully, with backups and verification. Use it to regain a stable state, then address the root ...

I have an 2009 27inch iMac Core i7. I only use it as a file server (stuffed in the basement out of site) because a year ago it developed a hardware problem somewhere in the video path. It's usable as ...