Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 21)

Mac mini (Late 2009) Symptom Charts — Startup and Power 21 2009-11-03
Remove the coin battery on 3.
the logic board, and leave out
for approximately 1 minute.
Then reinstall the battery. This
will reset the logic board. Does
the computer startup properly
now?
Yes Issue resolved by logic board
reset. Measure DC voltage
on the battery touching the
battery with the red probe,
and grounding with the black
probe. If voltage is 2.7v or less,
replace the battery. See KBase
article http://support.apple.
com/kb/HT3250 for details
on using a digital multi-meter.
M20
No Go to step 4.
Disconnect the drive carrier 4.
assembly and power on system.
With video only connected to
the board, is there a gray screen
with a flashing folder?
Yes Go to Step 5
No Replace logic board.. M02
Attempt to boot the system 5.
with a known good Firewire
boot drive. Does it boot?
Yes Go to Step 6.
No Replace the logic board. M02
Connect the interconnect 6.
board to the logic board. Is
there a gray boot screen with a
flashing folder?
Yes Go to step 7
No Replace the interconnect
board.
Remove the hard drives (one at 7.
a time) from the internal frame
assembly, install the internal
frame. Does the system boot
(other drive may be an optical
drive or second hard drive)?
Yes Go to step 8
No If the optical drive in not
recognized, go to Optical
Drive not recognized .
If the other hard drive in not
recognized, go to Hard Drive
Not Recognized
Install hard drive and optical 8.
drive into the internal frame
assembly, Does the system
boot the Install DVD, and see
the hard drive?
Yes Possible connection issue.
Retest to verify.
No Go to Hard Drive Not
Recognized .