Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 28)

Mac mini (Late 2009) Symptom Charts — Startup and Power 28 2009-11-03
Inspect display connector and 3.
display cables. Reseat. Does the
issue persist?
Yes Replace Logic board.
Go to step 4.
M04
No Issue likely caused by poor
connection. Return computer
to user.
Verify whether issue is still 4.
present with replacement logic
board installed.
Yes Go to step 5.
No Issue resolved with
replacement logic board
installed. Return system to
customer.
Test with another similar 5.
display with same display
connection to determine if
issue persists?.
Yes Replace logic board, may be
incompatible with the display.
Go to step 4.
M04
No Issue resolved with
replacement logic board.
Return system to customer.