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| [title] PRAM and NVRAM reset | |
| [* black] Shut down your Mac. | |
| [* black] Then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. | |
| [* black] You can release the keys after about 20 seconds, during which your Mac might appear to restart. | |
| [* black] You can release the keys after the Apple logo appears and disappears for the second time. | |
| + | [* icon_note] You ***must*** have a wired keyboard made by Apple in order for this to work. |
| + | [* icon_note] You can buy one from Amazon [https://www.amazon.com/gp/offer-listing/B000V07N9U/ref=dp_olp_all_mbc?ie=UTF8&condition=all|here]. |