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Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

Officially, the operating system that was available on that Mac at the time that you bought it is the oldest version of macOS that can run on that Mac. It's likely that an older OS won't include.

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If your macOS isn't up to date, you may be able to update to a later version.

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1. Ethernet MAC address: 00.00.75.45.08.9E PCMCIA card not installed in drive A. PCMCIA card not installed in drive B. To invoke install setup program from PCMCIA enter CONTROL-I. Executing power up self tests Power up self test passed DISKOS to be run. Verifying Diskos. OS RESTART. Meridian 1 X11 System Software Release: x112208d.
2. Burning a DVD Video using a Mac or MacBook Pro without iDVD, use the Open source application 'Burn'. OS X versions Leopard, Snow Leopard, Lion, Mountain Lion.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

What is the latest macOS version?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article will be updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar and Photos.

Apple’s Disk Utility and its First Aid feature may be one of the best and most familiar places to turn when things go wrong. But there are many problems that First Aid can’t solve. In such cases, Apple’s diagnostic programs may come to the rescue. Here are the ones I depend upon most often:

Network preference pane and Network Utility

If you’re having trouble with an Internet connection, your first stop should be the Network preference pane. Click on the Assist Me button. From the dialog box that appears, select Diagnostics. If you still need more help, and you have sufficient technical skills, try Network Utility (in /Applications/Utilities). See “Inside Network Utility” for a guide to its most useful features.

Activity Monitor

When you’re wrestling with systemwide problems, such as your Mac slowing down, Activity Monitor (in /Applications/Utilities) is the first place to turn. This program lists all your open processes, including applications as well as those behind-the-scenes activities that you don’t see in the Finder.

Start by checking Activity Monitor’s CPU column. If one application is consistently showing an especially high percentage (anything over 30 percent would certainly qualify), it may be the source of your problem. If it’s an application you know you can safely quit, highlight it and click on Quit Process. Otherwise, if you don’t want to chance quitting something unfamiliar to you, restart your Mac. For more information, see “Monitor misbehaving Macs”.

Console

You can’t fix anything with Console (in /Applications/Utilities), but with a little determination you can use it to learn what needs fixing. Check the admittedly arcane Console and System logs. Here you might see the name of an open application, together with some error message that sounds as though it could be related to your symptoms. Even if the mentioned application doesn’t appear to be related, quit it (especially if the timing of the message concurred with the symptom’s appearance). If the problem goes away, you now know where to focus your energy as you do further troubleshooting. For more information, see “Tracking down trouble with the Console”

System Profiler

The simplest and most straightforward of the lot, System Profiler (in /Applications/Utilities) provides a wealth of detail about the status of your hardware and software. Want a quick check to see if your Mac’s RAM is installed properly? Need to know whether you’re running the latest version of your printer’s driver? Want to know who manufactured your DVD drive and whether it can read +R DL (double-layer) discs? System Profiler can answer all of this and more.

If you’re planning a trip to the Genius Bar, System Profiler lists the serial numbers and firmware numbers of your hardware components—from the Mac itself to USB and FireWire peripherals. These numbers can often assist a Genius in diagnosing your problem. If you’re can’t bring all your peripheral devices with you, jot down the numbers for any hardware that you suspect may be related to your problem.