![]() ![]() ![]() To modify it, choose Apple Menu -> System Preferences., then click Sound. Since macOS Big Sur, the startup chime is again turned on by default. This is the only method to disable/enable the chime in macOS Catalina or earlier. To enable the chime, type in the following Terminal command: sudo nvram -d SystemAudioVolume To disable the chime, type in the following Terminal command: sudo nvram SystemAudioVolume=%80 2.3.5 AirPods Pro (2nd generation) CaseĮnabling/disabling the startup/shutdown chime Mac Through the Terminal. ![]() 2.3 Apple Silicon Macs and iPhone devices.1 Enabling/disabling the startup/shutdown chime.Do this routinely and you will keep your vintage Mac humming at optimum speed. Great job Mike, and thanks for the tips! A particularly useful one, after the one about disabling the RAM tests, is the tip to rebuild your desktop on a regular basis. In fact, the giantmike site has a full page of tips for speeding up your vintage Mac. I wish to extend a big thank you to “Giant Mike”, at whose web page (I found the magical keystrokes to show the hidden option in the Memory control panel. The next time you restart your Mac, you will observe that the boot process begins more or less immediately, resulting in a much shorter overall time from power on to fully booted. Select “Off” for the Startup Memory Tests, and close the panel. When selected in this way, a new option magically shows up at the bottom of the panel, which now looks like this: To unhide the RAM test enable/disable option, hold down the CMD+OPT keys while selecting the Memory control panel. It is the Memory control panel, but the Enable/Disable for the RAM tests is hidden! I am sure that his was done to protect users from themselves, but it also “protects” advanced users from accomplishing a useful task. A search of the web ensued, and ultimately I unearthed the answer. I hunted through all the other likely control panels, assuming that I had just remembered things incorrectly, or that perhaps the setting had been moved to a different control panel in Mac OS 9, but I simply could not find it anywhere. Quite to my surprise, it wasn’t there! Here is what you see on Mac OS 9.1 when you select the Memory control panel. Vaguely remembering that I could disable the tests via a setting in the Memory control panel, I went there looking for the setting. Simply stated, I got tired of waiting for the RAM tests to complete as a necessary precursor to booting and decided to disable them. One experiences the startup chime, then 45s to 60s of apparent nothingness, and then the boot process. That machine has only 128 MB of RAM deployed (the maximum amount the 840AV will support), but since the CPU is slower (0) the net result is about the same. The situation is very similar on my Quadra 840AV. About 45 seconds later it springs to life and Mac OS starts to load. You hear the startup chime, and then to all appearances the machine just sits there, doing nothing. During this time, there is no obvious outward sign that anything is happening at all. My Power Macintosh 7300/200 has 640MB of RAM, and the testing of this complement of memory takes between 45 seconds and a minute. The RAM test that once took a small number of seconds started to stretch out into a large number of seconds, introducing a very perceptible and somewhat heart stopping delay into the boot process. However, time moved on, and the amount of RAM being deployed in new Macintoshes increased by leaps and bounds. This sounds like a great idea in principle, and in the early days of Macintosh, it was probably a very good idea in fact as well. At the very start of the Macintosh boot process, after the startup chime, a Mac will undertake a RAM test to ensure that the machine’s RAM is fully operational before attempting to load the OS into it. ![]()
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