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If the problem persists in your new or Guest user account, then this suggests it is system-wide and not an issue with your home folder.

While these are not guaranteed to get you an answer or necessarily fix your system, they should at least get you closer to a solution.

First, generally characterize the problem by asking yourself what is happening.

Notice any errors and behaviors, and other actions you are taking that lead up to the problem at hand.

For example, if the system hangs, does this occur for about 30 seconds every time you boot, or does it happen at regular intervals, or perhaps is it random in nature In addition, ask yourself how long the problem has been happening, and whether or not it came about after any changes you made to the system, including software installs, upgrades, and changes to system settings.

Hardware troubleshooting Remove peripherals First unplug any peripherals you have, including printers, hard drives, extra displays, and scanners.

Run your system with only the keyboard and mouse and with just one monitor attached, and see if this makes a difference.

If so, then you can try swapping peripherals to different ports, or change the order in which they are attached to troubleshoot daisy-chaining.

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Update peripheral firmware and drivers Even if troubleshooting peripherals by unplugging or re-ordering them does not make a difference, still consider checking for and applying both firmware and drive software updates to the device.

Check with your devices manufacturers to see if there are firmware updates available, and install them.

This is especially true if you have recently upgraded or updated your system software.

Run Apple Hardware Tests Apple provides a test suite for all of its Mac systems, which will run a test on the RAM as well as check a number of different hardware sensors to ensure the system is running within voltage, amperage, and temperature tolerances.

To access the tests, reboot your system with the D key held, or Option-D to load the tests form the Internet, and from there you can run and interpret the tests.

Troubleshoot power sources Sometimes a system shutting down unexpectedly can be from faulty power adapters, so be sure you check the cabling and wall circuit you have yours attached to, and if troubleshooting the power adapter shows any problems, then consider replacing it.

Test your Wi-Fi signal strength If your problem is with Internet connectivity and you are experiencing drop-outs, then you might be experiencing heavy noise or low signal in your Wi-Fi connection.

Troubleshooting this will take time but can be done methodically by going to different locations and noting your connections signal-to-noise ratio.

By doing this, you can map out where noise may be coming from around your system, and adjust your environment accordingly.

Reset the PRAM and SMC The only real hardware-based fixes you can do for your Mac, at least without opening it or getting it serviced, are to reset the Parameter RAM (PRAM) and system management controller (SMC).

The PRAM can be reset by booting with the Option-Command-P-R keys held down, but resetting your SMC will require you to hold down a special combination of keys specific to your Macs model.

Software troubleshooting Boot to Safe Mode If your Mac is having trouble with some third-party software, then you can boot into Safe Mode to see if doing so avoids the problem.

Safe boot will load the system to a minimal boot environment, avoiding any nonessential software that potentially could be affecting the system.

If the problem goes away in Safe Mode, then it is likely rooted in the main operating system as opposed to a configuration in your user account.

New user account Try creating a new user account, or enable and log into the Guest account in the system.

This will run all your systems same software, services, and installed programs under fresh user settings, and thereby help determine if the problem is account-based or rooted in the system.

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