While keeping these keys pressed, press the Power button and hold that down for another 7 seconds. Press and hold the R Shift key, the L Option key(Alt), and the L Control key for 7 seconds. ![]() We tried to reset the SMC (with a removable battery) byġ) Shut down the Mac and disconnect the power adapter.ģ) Press and hold the power button for 5 seconds.Ĥ) Reconnect the battery and power adapter and press the power button to turn on the Mac. ( Note: You may need a wired keyboard for the reset).ģ) Hold the keys until the Mac restarts and you hear the startup chime for a second time and then let go of the keys. Model WDBMY0010BNC-NRSNĢ) Turn on your Mac and when you hear the startup chime, immediately press and hold the Command-Option-P-R keys. ![]() The new hard drive is a WD BLUE 2.5" 1 TB that says it is compatible with MAC OS X Sierra, El Capitan or Yosemite. His laptop is a Macbook Pro 15 mid-2012 with Mac OS 10.13.3. ![]() I got my husband a new hard drive at Best Buy and we can not get it to work.
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