A familiar type of computer error is the kind in which all activity seems to freeze, there's no apparent response to keyboard input, and the mouse stops moving. When this happens on Macs you may see the spinning color wheel, or the system may show no indicator of a problem. While you might think the system has fully crashed and needs to be restarted, a few seconds later the system may continue to function normally again, only to pause again shortly thereafter.
This type of random pausing is generally due to an I/O (input/output) problem. Critical devices … Read more