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Mac Pro Desktop will only randomly boot up

zovoth used Ask the Experts™
Greetings wise wizard of EE:

I'm helping a friend with an Mac Pro desktop computer, in which he replaced the spinning hard drive with a solid state drive, running Mojave OS. The computer will very randomly not boot up, instead produces the "prohibitory" symbol (ie: the "ghostbusters" strike through without the ghost). The odd thing is that even when it does boot up normally, it will randomly crash and produce this symbol again.

The operating system has already been reinstalled, so I'm not sure what else can be done. Any help would be greatly appreciated.

Many thanks and take care,

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Did you check that the cable was connected properly?
Top Expert 2013

and verify if there are firmware updates for his  SSD
Hardware Tester and Debugger
Hi there! :)

Try running the Apple diagnostics tool and post the results here.

1. Shut down your Mac.
2. Disconnect all external devices except your keyboard, mouse, display, wired network connection (if you have one), and power cable.
3. Turn on your Mac and immediately press and hold the D key.
4. Release the D key when the Hardware Test or Diagnostics tool appears onscreen.
5. Select your language.


Greetings wise wizard of EE:

Many thanks for your help, the issue was hardware related... replacing the drive did the trick.

Be well and take care,

NoahHardware Tester and Debugger

You're welcome! Glad I was of help :)