If an iMac keeps forgetting things like the sound volume or time zone, it may be becuse the battery is dead. MacBooks have a big battery of course, but desktop iMacs have little one too, so they can maintain the NVRAM contents. Basically, it is memory that retains its contents even when the power is switched off. On old Macs it is called PRAM, which stands for Parameter RAM, but on recent Macs it is called NVRAM (Non-Volatile RAM). The Apple Mac has a small amount of special memory that it uses to store a variety of important system settings. If you have tried everything else and problems persist, try these tricks. Hold down these keys when the Mac starts up to fix a variety of strange problems with Apple iMacs and MacBooks.
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