![]() Let us know what you find out when you perform the checks. so we can possibly find a board to check components etc. So we rely on you to let us know what 820-xxxx your logic board is etc. There are no schematics available for the Mac Mini. Return to customer or jump to appropriate troubleshooting flow. Video circuitry on logic board functional. Verify whether image appears on external display when system is booted.Įxternal display detected by system. Connect supported external display via mini-DVI port.Verify system functionality and return to user or jump to appropriate troubleshooting flow. Verify whether image appears on external display when system is booted. Connect supported external display via mini display port.(Reset SMC and clear PRAM if necessary for proper boot up.) Verify boot chime present and fans running when system powered ON.Unlikely cause: hard drive, optical drive, speakers, camera, microphone To leave Safe Mode, restart the computer normally, without holding down any keys during startup. ![]() During startup, ”Safe Boot” appears on the Mac OS X startup screen. Release the Shift key when you see the screen with the gray Apple and progress indicator (looks like a spinning gear).Note: The Shift key should be held as soon as possible after the startup tone but not before. Immediately after you hear the startup tone, press and hold the Shift key.Hold the keys down until the computer restarts and you hear the startup sound for the second time.Ī Safe Boot is a special way to start Mac OS X when troubleshooting.Important: You must press this key combination before the gray screen appears. Press and hold the Command-Option-P-R keys.Note: If the keyboard does not have an Option key, use the Alt key instead. ![]() 17 Communication may be one-to-one between users or may involve group messaging. 15 16 The instant messaging function includes sending text, voice notes, images, videos, and other files. You will need to these keys down simultaneously in Step 4. Signal (software) Signal is an encrypted messaging service for instant messaging, voice, and video calls.
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