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My Mac Pro (Late 2013 Desktop) won't power on.

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Tags: MacPro start up issues, problems and troubleshooting

Backstory: 

What happened?

My Mac Pro won't start up when I press the power button. 
When I physically move the MacPro, the port lights are turned on but the power button remained off.

What did I do?
  • I removed the Mac Pro cover, cleaned the insides from dust, removed and reinserted the RAM. 
  • Removed all peripheral devices.
  • Changed power points, turned off unnecessary electronics near the power outlet.
  • Pressed and held the power button for some time.
  • Tried various keyboard combinations during Startup

Resolution

Nothing worked. Then Miraculously the power button turned on by itself.


ReSearch

Getting Support from Apple Support

  • Apple Support> Mac> Mac Pro - https://support.apple.com/mac/mac-pro
    • Mac Pro Support
      • Get Help with Windows and Boot Camp
      • Get Help with Start Up
      • Learn about Mac Service
    • New to Mac
    • Featured Topics: Setup/ Displays/ Printing/ Wireless/ Accessories/ Memory
    • OS X Support
    • Resources
      • User Guides
      • Tech Specs
      • Downloads
    • Mac Pro Community: Find Mac Pro solutions from users around the world
    • Contact Apple Support
  • Talk to Apple Support Now - https://getsupport.apple.com/
    • Enter Your Serial Number

Suggested Troubleshooting Steps



Outlines

About the SMC (System Management Controller)


  • From https://support.apple.com/en-sg/HT201295 

About the SMC: 

The SMC is responsible for these and other low-level functions on Intel-based Macs:
  • Responding to presses of the power button
  • Responding to the display lid opening and closing on portable Macs
  • Battery management
  • Thermal management
  • The SMS (Sudden Motion Sensor)
  • Ambient light sensing
  • Keyboard backlighting
  • Status indicator light (SIL) management
  • Battery status indicator lights
  • Selecting an external (instead of internal) video source for some iMac displays

How to Reset the SMC on Mac Desktop Computers

  1. Shut down the Mac.
  2. Unplug the power cord.
  3. Wait 15 seconds.
  4. Plug the power cord back in.
  5. Wait 5 seconds, then press the power button to turn on the Mac.

When will SMC Need to be Reset?


After you perform normal troubleshooting, these symptoms may indicate that an SMC reset could be necessary:
  • The computer fans run at high speed, though the computer is not experiencing heavy usage and is properly ventilated.
  • The keyboard backlight behaves incorrectly on Mac computers that have this feature.
  • The status indicator light (SIL) behaves incorrectly on Mac computers that have this feature.
  • Battery indicator lights, if present, behave incorrectly on Mac notebooks that have a non-removable battery.
  • The display backlight doesn't respond correctly to ambient light changes on Mac computers that have this feature.
  • The computer doesn't respond to the power button when pressed.
  • A Mac notebook computer doesn't respond properly when you close or open the lid.
  • The computer sleeps or shuts down unexpectedly.
  • The battery doesn't charge properly.
  • The MagSafe power adapter LED doesn't indicate the correct activity.
  • The computer is performing unusually slowly, though it isn't experiencing abnormally high CPU utilization.
  • Application icons may bounce in the Dock for an extended amount of time when opened.
  • Applications may not function correctly, or they may stop responding after being opened.
  • A computer that supports target display mode does not switch into or out of target display mode as expected, or it switches into or out of target display mode at unexpected times.
  • The illumination around the I/O ports on a Mac Pro (Late 2013) does not activate when you move the computer.


About the NVRAM (Non-Volatile Random-Access Memory)

  • From https://support.apple.com/en-sg/HT204063

About the NVRAM

The NVRAM stores settings where the OS can access quickly and may include the following
  • Speaker volume
  • Screen resolution
  • Startup disk selection
  • Recent kernel panic information, if any

How to Reset the NVRAM

  1. Shut down your Mac.
  2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. 
  3. Turn on your Mac.
  4. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
  5. Hold these keys until the computer restarts and you hear the startup sound for a second time.
  6. Release the keys.

Logic Board (Mother Board)


Further Steps to resolve NVRAM related issues

  • If issues related to these features continue on a desktop Mac, its logic board battery may need to be replaced. 
  • The logic board battery on desktop computers helps retain NVRAM settings when your Mac is unplugged. 
  • You can take your Mac to an Apple Store or Apple Authorized Service Provider to replace the battery on the logic board.

Fix it Yourself: NOT RECOMMENDED

Older Versions of Mac Pro Logic Board Replacement




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