Long term PC user, looking to jump to Mac.

[The_Interloper]

No I don't, in all honesty, I didn't even realise that there was a diagnostics built in.

https://support.apple.com/en-gb/HT202731

 

[Howard2k]

No I don't, in all honesty, I didn't even realise that there was a diagnostics built in.

Turn off the MBPro (shutdown, not sleep). Turn it on and once you've pressed the power button immediately hold the D key. Keep holding it until the diagnostic tool starts. If the MacBook boots normally you may have been too slow with the D key.

It will run a diagnostic and let you know the results.

 

[jwar1976]

Thank you @The_Interloper & @Howard2k for that information.