The Extensions Manager's All Off set and restarting while holding down the Shift key do not have the same effect. Each method "switches off" or "disables" some types of extensions that the other does not.

For example, the Extensions Manager switches off Chooser extensions while holding the Shift key down during restart does not. The Extensions Manager does not show or switch off most of the more esoteric extensions, such as System Updates, whereas the Shift down restart usually does.

In general, the Shift down restart usually switches off more extensions than the Extensions Manager. When you are trying to isolate an extension conflict and are not sure if it is an Apple System extension or a third party extension, restart while holding down the Shift key.

Few third party software items use extension types that the Extensions Manager does not recognize and turn off in the All Off set. The rare exception may be a monitor or other device driver. A Shift down restart usually does not disable these extensions either. Starting up from another volume (hard drive or floppy disk) or performing a clean install allows the bypassing of these types of extensions.

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