Press and hold shift + control + option and then press the power button. Hold all four keys down for 10 seconds. Release the keys and power button all at the same time. Press the power button to turn on your Mac.
How to reset SMC & PRAM on Macbook Pro & Air (El Capitan)
Sometime some devices such as USB ports or HDMI port not functioning properly. There are something called 'SMC (System Management Controller)' and 'PRAM (parameter random-access memory)' on your macbook and if there is a problem or crash on the SMC or PRAM, your macbook pro retina might not work correctly. In this case, SMC and PRAM needs to be reset. Here is an easy solution you should try to fix this issue before you bring it to the Apple Store.
Same problem here, it happens with a thunderbolt Apple display, and a thunderbolt LG display, and it's sometimes fixed after connecting/reconnecting/changing USB ports for the keyboard. On the LG even that did not work, only a complete reboot. I'm googling now for a USB reset solution that does not reboot my Mac. You can reboot or reset the USB ports on your Mac to make them operational again. Step 1: Reboot the Mac Rebooting is an easy solution to a lot of computer problems. Rebooting the Mac resets certain hardware conditions, which may solve the USB port issues. Shutdown your Mac. Connect the power adapter to the Mac. Hold down the Shift+Control+Option keys and the Power button at the same time from the Macbooks keyboard. Release all keys and the power button at the same time. Step 1: Reboot the Mac. Rebooting is an easy solution to a lot of computer problems. Rebooting the Mac resets certain hardware conditions, which may solve the USB port issues. Step 2: Reset the NVRAM. NVRAM, or non-volatile random-access memory, is a part of the Mac that stores certain settings that can impact hardware performance.
Symptoms you might have due to SMC or PRAM collision:
- USB ports not reading (USB or external devices not recognizing)
- HDMI ports not working
- Battery not charging (Won't charge to 100%)
- Cooling fan not spinning too slow or too fast
- MacSafe Power adaptor indicator not displaying
- Volume key not working (Sound issues)
- Screen Brightness control not working
- Backlight Keyboard not working
- Network Issues (won't connect on Wi-Fi or bluetooth)
NOTE: There are two different MacBooks. One with a removable battery, one with a built-in battery. Use the right method for your MacBook!
How to reset SMC with a macbook with built-in battery
Step 01.Shut down your MacBook.
Step 02.Connect the MagSafe power adapter into your MacBook. If it's already connected, leave as is.
Step 03. Press Shift + Control + Option + Power keys at the same time.
Step 04.Release all the keys from the keyboard.
Step 05. Press the power button to start your MacBook.
How to reset SMC with a MacBook with removal battery
Step 01.Shut down your Macbook.
Step 02.Unplug the Magsafe Power Adapter from your MacBook.
Step 03.Remove the battery.
Step 04. Press and hold the power button for 5 seconds.
Step 05.Release the power button after 5 seconds.
Step 06.Insertthe battery and plug the Magsafe Power Adapter back in.
Step 07. Press the power button to start your MacBook.
How to reset PRAM for All MacBook Laptops
Step 01.Shut down your MacBook.
Step 02. Press and Hold Option + Command (⌘) + P + R.
Step 03.Turn on your MacBook while holding the keys (Option + Command (⌘) + P + R).
Step 04.Keep holding the keys (Option + Command (⌘) + P + R) until your MacBook restarts (You will see the grey screen appears before it restarts.)
Step 05.Release the Keys.
Step 06. If you hear the startup booting sound for the second time, that means the PRAM has been reset.
Restoring Mac from external hard drive on Mac is one of the choices that people apply if they can't connect to a stable Wi-Fi while restoring a Mac. And it is also an exclusive feature that Mac turns any removable storage device into a recovery tool. Here are the 7 steps you need to know for how to restore Mac from External hard drive, including USB flash drive.
Note: while using a USB memory stick to restore Mac, all data on the device will be erase completely. If you have some important files there, please move them to somewhere to store first.
Step 1. Find and launch Disk Utility. It is in the Utilities folder under Applications. Next, plug in your USB hard drive to the USB slot on your Mac, making sure it is connected with your Mac. When connected successfully, it should appear in the window or the Disk Utility window. Select it, then select the Partition heading.
Step 2. In the Partitions Layout heading, select 1 Partition from the drop-down list. Click Options, then click GUID Partition Table heading, then OK.
Step 3. Click the drop-down list for the Format and select Mac OS Extended. Name it and select Apply. Click the Partition button in the dialogue.
Step 4. When it finished for step 3, go to http://support.apple.com/kb/DL1433 to download the Recovery Disk Assistant. The downloaded Recovery Disk Assistant will detect the USB drive. You need to ensure the action and click Continue, typing in the right password you have set for the Mac.
Step 5. The data will be written to the disk. Be patient and keep your USB hard drive connected firmly until it prompts to.
Step 6. To use the new recovery stick, you need to insert the USB hard drive again and reboot. Before the Apple logo appears, hold down Option and Command keys. Next, click the USB icon in the window to select it.
How To Reset Mac Usb Ports Not Working
Step 7. When the recovery system has booted, choose the option you need. Among them, Disk Utility is the most useful tool. It will repairs errors that might prevent your Mac from booting.
Whether you restore Mac from USB hard drive or with the built-in internal recovery, it will always cause data loss. To restore the lost data back to Mac, you need to have the most powerful and useful software, iBeesoft Data Recovery for Mac, installed. It will scan your Mac to look for and recover deleted or lost photos, videos, audio files, archives, emails, documents and more. Here are some of its salient features:
- 1.supports hundreds of file types, including videos, photos, audio files, documents, ebooks, archives, and more. And for each type of files, it supports almost all the file formats. For example, it supports videos in mp4, flv, avi, mov, mpeg, mkv, etc.
- 2.It is free for recovering up to 200MB files. If your file size is smaller than 200MB, you use it for free. It is the exclusive feature among all the data recovery tools over the Internet.
- 3.The Mac data recovery software is easy to use. There is a built-in simple guide. You just need to click to select the options offered in each window. No extra technique is needed for data recovery.
- 4.It is standalone, needing no extra software. It is virus-free and has no security issue. No data is collected. All files it found are listed only for you to choose to recover.
How To Reset Mac Usb Ports Windows 10
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