Not before, and not after. You pulled out? That was the hard part completed, now the easy stuff. It will load as normal. Now insert your USB drive with the operating system on it. Copy all the files from it to any location on your hard drive. I copied them into the Download folder, but you can put them anywhere you like. Now open the folder you copied onto your hard drive. Look inside and you will find a big 4GB file ending in. This is the main file you need. Use the usb guide above to do this.
Click on this big. Now go back to disk utility. Click on the InstallESD. It shows two area you need to enter. Source and Destination. Source should already be filled with InstallESD.
If it is not, then enter that now by browsing to the big file and inserting it into the Source box. So drag and drop that from the left panel to the Destination part. When you are happy click the restore button to start the restore process. This takes around 30 minutes. Then shut down, or restart the computer.
As it is turning on hold down the ALT key. This will show a special screen allowing you to select a startup disk drive. Select the USB drive it is usually orange. There was a problem installing Mac OS X, try reinstalling. If you get this error you will need to zap PRAM. Simple instructions for zapping P RAM below. When you turn on the Macbook Pro with the above keys held it will quickly reset and the screen will go to full brightness.
This is the indicator that the PRAM has been cleaned. I take no responsibility if any of the advice here or on this website damages anything! I have completed every step here myself and have no fear doing it again, it is safe as far as I am concerned. Then turn on again while holding the ALT key on the left of the keyboard. Yes, just the ALT key and nothing else. The ALT key is near the Cmd key which is on the left of the space bar.
When it starts it will show you some hard drive options. Choose the orange Hard drive that represents your USB drive. Click it and it will take you to the install Lion screen. Now just follow the simple instructions to complete the installation of Lion! It takes about 8 minutes to prepare installation and 35 minutes to complete the installation process itself.
You Macbook Pro will restart when the process is complete. You can now repeat this process at any time to reinstall OS X on your Macbook Pro without needing an internet connection. This process can work for other Macbook Pro versions too. Drag the InstallESD. Drag the drive or partition from the left-hand column into the Destination field. Press the Restore button. When the process is complete, your external drive can be used as a Lion boot drive, and also to install Lion on other Macs.
To learn how to boot from this drive, perform a clean install or just install Lion on another Snow Leopard Mac, see Steps First, insert a blank DVD. Open Disk Utility, and press the Burn button on the left of the top bar. A window opens entitled Select Image to Burn.
In this window, navigate to and select the InstallESD. A window opens in Disk Utility inviting you to burn the disc — do so. When it's finished, the disc is ejected. You've created a boot DVD. To boot your Mac from your newly created DVD or external drive, first insert the disc or connect the drive. Restart your Mac while holding down the Option key. You're given a choice of devices to boot from. Select your new boot volume and it boots to this window.
Plug in and follow the prompts. No matter which method you prefer, be sure that you backup any important data on your USB drive, as the procedure of creating bootable USB will delete everything on it.
Mac OS X Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes. Select the volume containing the bootable installer, then click Continue.
Customers get Software upgrades for Mac computers through the online app store ever since the release of macOS Lion. Be it a clean install or upgrade, Mac App store require you connect to the internet to download whole installation files. The online OS update is OK if you have stable broadband connectivity and enough bandwidth. Apple also provides an option for internet recovery of macOS if your computer fails to boot.
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