More resources, service, and support for your Mac
You can find more information about your Mac Pro in System Report, Apple Diagnostics, and through online resources.
System Report. To get information about your Mac Pro, use System Report. It shows you what hardware and software is installed, the serial number and operating system version, how much memory is installed, and more. To open System Report, choose Apple menu 
> About This Mac, then click System Report.
Apple Diagnostics. You can use Apple Diagnostics to help determine if there’s a problem with one of the computer’s components, such as the memory or processor. Apple Diagnostics helps to identify the potential source of a hardware issue and provides first steps to try and resolve it. Apple Diagnostics will also help you get in touch with AppleCare Support if you need more help.
Before using Apple Diagnostics, disconnect any external devices, such as a hard disk or external display. Be sure the Mac Pro is connected to the Internet.
To start Apple Diagnostics, restart the Mac Pro and hold down the D key as it starts up. If prompted, select the language for your location. Press the Return key or click the right arrow button. The basic Apple Diagnostics test takes a few minutes to complete. If issues are found, a description of the issue appears with additional instructions. Make a note of any reference codes before you exit Apple Diagnostics, in case you need to contact AppleCare Support.
Online resources. For online service and support information, go to Welcome to Apple Support. You can learn about Apple products, view online manuals, check for software updates, connect with other Apple users, and get service, support, and professional advice from Apple. For more information about your Mac Pro, go to Mac Pro Support.
AppleCare support. If you need assistance, AppleCare representatives can help you with installing and opening apps, and with troubleshooting. Call the support center number nearest you (the first 90 days are complimentary). Have the purchase date and your Mac Pro serial number ready when you call.
A complete list of support telephone numbers is available on the web at Contact Apple for support and service. Telephone numbers are subject to change, and local and national telephone rates may apply.
Your 90 days of complimentary telephone support begins on the date of purchase.