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How to Access Terminal via Recovery Mode for Mac

Access Terminal via Recovery Mode for Mac Some more advanced Mac troubleshooting and diagnostics techniques require a user to access the Terminal from Mac OS Recovery Mode. We’ll show you how to quickly access the command line while a Mac is booted into Recovery Mode. For some quick background, on a normally booted Mac, the Terminal application is found within the /Applications/Utilities/ folder, and it can be accessed directly through the folder hierarchy or by using Spotlight to search for and launch Terminal app. But Recovery Mode does not have the same applications directory access, nor does it have Spotlight or Launchpad. Nonetheless, accessing Terminal from Recovery boot mode is easy. Accessing the Command Line in Recovery Mode on a Mac Boot into Mac OS Recovery Mode as usual by holding down the Command and R keys during system start Choose the language as usual (if applicable) At the “MacOS Utilities” screen, pull down the “Utilities” menu from the top of the

How to Troubleshoot wireless mouse and keyboard issues

If your Apple wireless mouse, keyboard, or trackpad aren‘t working as expected Try these steps to fix issues with your Apple wireless mouse, keyboard, or trackpad. Your device isn't recognized by your Mac Your mouse, keyboard, or trackpad intermittently stops responding Your mouse doesn't scroll up or down or side to side Your mouse or trackpad doesn't track as expected Your keyboard has one or more keys that don't respond Your device isn't recognized by your Mac Follow these steps if your mouse, keyboard, or trackpad isn't recognized by your Mac. Make sure that your wireless mouse, keyboard, or trackpad is turned on The Magic Mouse and Magic Mouse 2 have a slide switch on the bottom of the device. Slide the switch to turn on the device. On the Magic Mouse, the green LED briefly lights up. On the Magic Mouse 2, green coloring is visible beneath the switch. The Magic Keyboard and Magic Trackpad 2 have a slide switch on the ba

Power On Self Test (POST) in iMac 21.5 inch, 2009

Intel-based Mac computers such as the iMac rely on a combination of tones to indicate Power On Self Test (POST) error codes. • If the computer detects out-of-specification or no SDRAM, the screen will remain black but the computer will beep. This error condition may be due to physically damaged RAM, installing incorrect type of RAM, or not having RAM installed. • Some RAM may appear to pass the Power-On-Self-Test (POST) but still cannot be used by the operating system. In this case, the computer will display a gray screen, sound three tones and repeat tones until computer is turned off. • The solution to both of these situations is to first re-seat memory and test computer again. If memory fails POST again, remove all installed memory and test by installing one by one each memory module that has been verified to work correctly on another system (i.e., “known-good”) or order new memory. • A sequence of tones heard at startup or a no video symptom may also be fixed by

Resetting the System Management Controller (SMC)

The System Management Controller (SMC) is a chip on logic board that controls all power functions. If computer is experiencing any power issue, such as not starting up, not displaying video, sleep issues, or fan noise issues, resetting SMC may resolve it. To reset SMC on an iMac: 1. From Apple menu, choose Shut Down (or if the computer is not responding, hold power button for approximately ten seconds until it powers off). 2. Unplug all cables from computer, including power cord. 3. Press and hold the power button for 5 seconds. 4. Release the power button. 5. Attach the computer’s power cable, making sure power button is not being pressed. Note: If you press the power button while inserting the power cord, the iMac will enter a mode in which the fans run at full speed. 6. Press the power button to turn on the computer.

How to Reset Parameter RAM (PRAM) in iMac 2015

PRAM stores certain system and device settings in a location that Mac OS X can access quickly. Exactly which settings are stored in the computer’s PRAM varies depending on the type of computer as well as the types of devices and drives connected. To reset PRAM: 1. Shut down the computer. 2. Locate the following keys on keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in Step 4. Note: If the keyboard does not have an Option key, use the Alt key instead. 3. Press power button. 4. Immediately press and hold Command-Option-P-R keys. Important: You must press this key combination before the gray screen appears. 5. Hold down keys until the computer restarts, and you hear the startup chime a second time. 6. Release keys. if you still have problems call us +1-855-517-2433

how to LED Startup Sequence in iMac 2015

LED #1 = Power available. If no LED is visible: • Verify AC source • Verify known-good AC cable is connected • Verify cable connection between AC inlet and power supply • Verify cable connection between power supply and logic board • Verify power supply LED #1 + LED #2 = Power available, and system is powered on. If second LED is not visible when power button is pressed: • Verify power button connection to logic board • Verify power button functionality • Verify cable connection between power supply and logic board • Verify power supply • Verify logic board LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found . If third LED is not visible after power on: • Verify that MXM video card is seated properly • Verify logic board LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found. If fourth LED is not visible after power on: • Verify cable connections between LCD pane