Reset pram mac mini g4
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How to Reset PRAM on a Mac
Handling system resets from various commands. Controlling the fans. If your computer isn't responding, perform these steps one at a time, in this order, until the issue has been resolved: Force Quit Option-Command-Escape. Restart Control-Command-Power. Force Shut Down press the power button for 10 seconds.
No video Mac mini
Resetting the SMC can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so forth. If your computer still exhibits these types of issues after you've restarted the computer, try resetting the SMC. From the Apple menu, choose Shut Down or if the computer is not responding, hold the power button until it turns off.
Unplug all cables from the computer, including the power cord and any display cables. Wait at least fifteen seconds.
Mac Expert Guide
Plug the power cord back in, making sure the power button is not being pressed at the time. Then reconnect your keyboard and mouse to the computer.
Press the power button to start up your computer. Open and remove the metallic outer door. Use a non-metallic, non-conductive object, such as a wooden pencil. Replace the metallic outer door.
This functionality has been replaced by the SMC. Apple said:. Wait at least 15 seconds.
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Press the power button on the back to start up your computer. The iMac Early and later models do not have a button on the main logic board for resetting the SMC, which eliminates the need to remove the computer's cover to reset it as required for some earlier models.