If your Mac was produced in early 2011 or earlier and runs Mac OS X 10.7 Lion or later, it doesn't have Internet Recovery in its ROM. If that doesn't work, continue with step 2. Otherwise, you reinstall the OS that came with your Mac or the closest available version. If you upgraded to macOS Sierra 10.12.4 or later, you get the latest macOS version compatible with your Mac. Try clicking Disk Utility to erase your startup disk again, then tap on the "Reinstall OS X (macOS)" option to reinstall macOS/OS X. When Internet Recovery is loaded, you will see the OS X Utilities window. Restart your Mac, then immediately press and hold Command + Option + R until the spinning globe appears. If your Intel Mac is manufactured from late 2011 onwards and runs Mac OS X 10.7 Lion or later, you can utilize Internet Recovery without extra software. To drive your Mac to search for an updated reinstall certificate online, you need to switch to Internet Recovery, which starts with a built-in ROM that allows your Mac to connect to the internet and download recoveryOS and bootstrap reinstalling OS X. That's likely because your laptop's certificate for Mac OS X reinstalls has expired. Suppose you can't reinstall macOS with Command + R, which starts your Mac from the built-in macOS Recovery System. Step 1: Restart in Internet Recovery Mode.
Reinstall OS X from a bootable installer. Check your startup disk's SMART status with Disk Utility. It also introduces haptic feedback to MacBook Pro - allowing you not just to see what's happening on the screen, but to feel it. This lets you have a deeper connection to your content, bringing more functionality right to your fingertip. The Force Touch trackpad takes all the capabilities of Multi-Touch and adds force sensors that detect subtle differences in the amount of downward pressure you apply. The MacBook Pro with Retina Display also features the Force Touch trackpad. Graphics are handled by integrated Intel Iris Graphics. This MacBook Pro also adds an HDMI port so HDMI-compliant devices, particularly HDTVs, are now natively supported as well. Any Mini DisplayPort-compatible display will plug in without the need for an adapter. You'll be able to output to 2 external displays at up to 2560 x 1600 via Thunderbolt 2 (Mini DisplayPort). With 227 pixels per inch, this MacBook Pro has a pixel count of over 5 million. The widescreen, LED-backlit IPS screen has a glossy finish and a native resolution of 2560 x 1600. It is loaded with advanced power management features and an integrated lithium polymer battery, which work together to provide up to 9 hours of wireless web browsing. The 13.3" MacBook Pro Laptop Computer with Retina Display (Early 2015) from Apple is a powerful notebook computer with an innovative, ultrathin, ultraportable aluminum unibody design.
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