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App to brighten screen mac. Here, you can show or hide notifications on the lock screen, decide whether to show notification previews and when, and whether to show notifications in the Notification Center.

Dec 13, 2018  On Mac computers that have the Apple T2 Security Chip, pressing the power button at about the same time that you plug in the power cord can cause the Mac to enter a mode in which the fans run at full speed.Shutting down the Mac and starting it up again might not resolve the issue. To resolve the issue, reset the SMC.Your Mac should now start up and work as expected. Jun 29, 2017  Getting Start With Macs Fan Control. To get started, head to the Macs Fan Control download page and grab the Mac version (There’s a Windows version, but is only intended for Macs running Windows with Boot Camp—other PC fans aren’t supported.) The download comes in a ZIP archive, which you can unarchive simply by opening it.

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In rasterized video display generator systems stationary 'stripes' (like boxes) are generally indicative of either memory array (draw buffer[s]) or output array write, read or output addressing-counter failures. In such 2 dimensional flat 'table' arrays, each row and column location (and blocks of the same) is/are formed of data applied at numerical x-y addresses.
Each numerical 'x' or 'y' (row or column) range of addresses represent some vertical or horizontal 'stripe' range, as any specific 'block' represents an intersection of the coincidence of those two ranges of addressing-counter regions. The lowest numbered physical address (start) is in one corner and the highest numbered address (end) is at the diagonally opposite corner of the stored or drawn 'x-y table array'.
In a (more simply described for example) simplified base-10 example, addressing-counter numbers are generally formed/generated by some sort of a serial to parallel decoding array that reuses the 'fine' 0-10 or 0-100 (hottest, fastest, hardest-working 'fine' address-counting) counter by merely occasionally incrementally adding a 'coarse' 10-100, 100-1,000, 1,000-10,000, 10,000-100,000 (etc) 'bit' to the address-count output to get it up to the higher address-count location-range numbers. Repeating 'stripes' are thus indicative of a (repetitive) failure of the underlying 'fine' address-counting numbering decoder.
If the 'fine' (0-100 ex) decoder starts missing it's ability to generate addressing numbers, say for example, from '50-100' during each count-up sequence, then the array will be striped (empty of data) in equal stripes all the way up the range, since those array locations cannot be addressed to be read, rewritten or output.
Stripes don't indicate a failure of the display, they indicate a failure of the display's own controller/driver circuits, the GPU or the graphics card's output or the display's input/output interface.
Otherwise the failure to refresh, redraw, erase or move a moving or movable block of data like a program window or animation graphic element within it (a so-called 'sprite-block' of local image data) or deal with it's overlay-depth-priority or transparency (box-trails) is a problem in the RAM addressing, rewriting or data manipulation/flow handling of the GPU (or data or software instruction) itself.
Since modern low single voltage DRAMs don't heat up like their older progenitors 90% of these sorts of (non-defect) failures are voltage or thermal parallel addressing counter/connection related.

Reset the SMC on computers that have the T2 chip

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If your Mac has the Apple T2 Security Chip, follow these steps. If you need help, contact Apple Support.

Notebook computers with the T2 chip

Before resetting the SMC, try these steps:

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  1. Shut down your Mac.
  2. Press and hold the power button for 10 seconds, then release the button.
  3. Wait a few seconds, then press the power button to turn on your Mac.

If the issue persists, follow these steps to reset the SMC:

  1. Shut down your Mac.
  2. On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.
    • Control on the left side of your keyboard
    • Option (Alt) on the left side of your keyboard
    • Shift on the right side of your keyboard
  3. Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.
  4. Keep holding all four keys for another 7 seconds, then release them.
  5. Wait a few seconds, then press the power button to turn on your Mac.

Desktop computers with the T2 chip

  1. Shut down your Mac, then unplug the power cord.
  2. Wait 15 seconds, then plug the power cord back in.
  3. Wait 5 seconds, then press the power button to turn on your Mac.

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Reset the SMC on other computers

If your Mac doesn't have the Apple T2 Security Chip, follow these steps. If you need help, contact Apple Support.

Notebook computers with a nonremovable battery

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  1. Shut down your Mac.
  2. On your built-in keyboard, press and hold all of these keys:
    • Shift on the left side of your keyboard
    • Control on the left side of your keyboard
    • Option (Alt) on the left side of your keyboard
  3. While holding all three keys, press and hold the power button as well.
  4. Keep holding all four keys for 10 seconds.
  5. Release all keys, then press the power button to turn on your Mac.

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Notebook computers with a battery that can be removed

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This applies to all MacBook Pro and MacBook models introduced in early 2009 or earlier, as well as the MacBook (13-inch, Mid 2009).

  1. Shut down your Mac.
  2. Remove the battery. (If you need help removing it, contact an Apple Store or Apple Authorized Service Provider.)
  3. Press and hold the power button for 5 seconds.
  4. Reinstall the battery.
  5. Press the power button to turn on your Mac.

Desktop computers

  1. Shut down your Mac, then unplug the power cord.
  2. Wait 15 seconds, then plug the power cord back in.
  3. Wait 5 seconds, then press the power button to turn on your Mac.
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About the SMC

The system management controller is responsible for managing behaviors related to these features:

  • Power, including the power button and power to the USB ports
  • Battery and charging
  • Fans and other thermal-management features
  • Indicators or sensors such as status indicator lights (sleep status, battery charging status, and others), the sudden motion sensor, the ambient light sensor, and keyboard backlighting
  • Behavior when opening and closing the lid of a notebook computer

Resetting the SMC doesn't affect the contents of NVRAM or PRAM.