Install and recovery apple lap os

About macOS Recovery

The utilities in macOS Recovery help you restore from Time Machine, reinstall macOS, get help online, repair or erase a hard disk, and more.

macOS Recovery is part of the built-in recovery system of your Mac. You can start up from macOS Recovery and use its utilities to recover from certain software issues or take other actions on your Mac.

How to use macOS Recovery

Hold down Command-R or one of the other macOS Recovery key combinations on your keyboard immediately after pressing the power button to turn on your Mac, or immediately after your Mac begins to restart. Continue holding until you see the Apple logo or a spinning globe. Startup is complete when you see the utilities window:

After starting up from macOS Recovery, select from these utilities, then click Continue:
Restore From Time Machine Backup: Restore your Mac from an external hard drive or Time Capsule that contains a Time Machine backup of your Mac.
Reinstall macOS (or Reinstall OS X): Download and reinstall the Mac operating system.
The Reinstall macOS utility installs different versions of macOS depending on the key combination you used while starting up. For details, see How to reinstall macOS.
Get Help Online: Use Safari to browse the web and find help for your Mac. Links to Apple's support website are included. Browser plug-ins and extensions are disabled.
Disk Utility: Use Disk Utility to repair or erase your startup disk or other hard disk.
These additional utilities are available from the Utilities menu in the menu bar:

• Firmware Password Utility
• Network Utility
• Terminal

To quit macOS Recovery, choose Restart or Shut Down from the Apple () menu. If you want to choose a different startup disk before quitting, choose Startup Disk from the Apple menu.

If you can't start up from macOS Recovery

Newer Mac computers and some older Mac computers automatically try to start up from macOS Recovery over the Internet when unable to start up from the built-in recovery system. When that happens, you see a spinning globe instead of an Apple logo during startup. To manually start up from macOS Recovery over the Internet, hold down Option-Command-R or Shift-Option-Command-R at startup.
If you still can't start up from macOS Recovery, and you have a Mac that is able to start up completely, you might be able to create an external Mac startup disk to start up from instead.
macOS Recovery over the Internet, the Reinstall macOS utility, and the Get Help Online utility all require an Internet connection. If you need to connect to a Wi-Fi network, move your pointer to the top of the screen, then choose a network from the Wi-Fi status menu . 

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power on and press  Command +R for recovery menu.
Select recovery from time machine backup

Mac Start up scheme
ALT + Option

Shift key Safe boot

Command + Option +R
Wifi  menu
Password
Download the software and install

Unable to refresh or reset PC after Automatic Repair fails in Windows 8

Symptoms

Consider the following scenario:

• You have Windows 8 or Windows 8 Pro installed on your PC.
• Your PC fails to boot into Windows and launches Automatic Repair to attempt to repair Windows.
• Automatic Repair is unable to repair your PC and you select "Advanced options".
• After selecting "Troubleshoot", you choose to either "Refresh your PC" or "Reset your PC".

In this scenario, recovery may fail and you are returned back to the main WinRE screen.

Cause

This issue may occur if the System or Software registry hives have become damaged or corrupted.

Resolution

To attempt to resolve this issue, follow the steps below.

NOTE: Following these steps should only be used if you are attempting to use the "Refresh your PC" or "Reset your PC" options in Windows RE because your system is in a non-bootable state.

1. After Automatic Repair fails to repair your PC, select "Advanced options" and then "Troubleshoot".
2. Select "Advanced options" and then select "Command Prompt".
3. If prompted, enter in the password for the user name.
4. At the Command Prompt, go to the \windows\system32\config folder by typing the following command: cd %windir%\system32\config.
5. Rename the System and Software registry hives to System.001 and Software.001 by using the following commands:
   ren system system.001
   ren software software.001
   
   NOTE: Renaming the Software hive will not allow you to use the "Refresh your PC" option. If you want to use the "Refresh your PC" option, only rename the System hive. If the Software hive is also corrupt, you may not be able to use the "Refresh your PC" option.
6. Type "exit" without the quotes to exit the Command Prompt and reboot the PC back to the Automatic Repair screen.
7. After selecting "Advanced options" and then "Troubleshoot", select either "Refresh your PC" or "Reset your PC".

More Information

Using the "Reset your PC" option will remove all of the files on your hard drive and resets your PC back to the version of Windows 8 that was preinstalled by the OEM on your PC. All new applications that were installed on your PC after you purchased it will need to be reinstalled.

How find compatible electronic Parts

We have big problem about compatible electronic parts for repair electronic circuits. therefore we need to know or follow the data sheet or book for compatible part if there no named part .

These are few web site for find component easily .

Ex:

M3004D mosfet

https://geosquare.in/CHINA-country/M3004d-mosfet.htm


Here is the listing from daily list of import records released by government of India for the keyword `M3004d mosfet` imported from China .

As per our records it was last imported on 09 Nov 2016 at under HS code 85412900 with quantity 6150 as TRANSISTOR PART NO. 192802 STD3NK50Z-1 TRANS MOSFET N-CH 500V 2.3A from CHINA at the price of Rs.10.36

The items with the keyword `M3004d mosfet` is commonly imported under the name like TRANSISTOR PART NO.10106072 SThttp://pdf1.alldatasheet.net/datasheet-pdf/view/24500/STMICROELECTRONICS/P7NB80FP.htmlD7NM60N MOSFET 800V 0.95 OHM, TRANSISTOR PART NO. 192802 STD3NK50Z-1 TRANS MOSFET N-CH 500V 2.3A, 781-SIR426DP-GE3 LQF-MSIR426D-S17 SIR426DP-T1-GE3 - VISHAY MOSFET.

The average import price of items with keyword `M3004d mosfet` is Indian Rupees 444.



http://www.findchips.com/search/IRF9Z34N