Check the POST
Open System Information in Utilities and then select ‘Diagnostics’ on the left. It shows the result of POST (Power On Self Test) and it should say ‘Passed’. Investigate if it does not.
Open System Information in Utilities and then select ‘Diagnostics’ on the left. It shows the result of POST (Power On Self Test) and it should say ‘Passed’. Investigate if it does not.