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TB272 Rev3 – Black M400 Console or M39 PC Not Booting Up
Purpose
To provide troubleshooting tips when an M400 console or M39 PC which both use a standard PC
motherboard isn't booting up
Requirements
Technical Bulletin 114
Technical Bulletin 274 if your motherboard is a Gigabyte GAM61SMES S2 motherboard
Technical Bulletin 275 if your motherboard is a Gigabyte GAM61PME S2P motherboard
CR2032 battery that can be purchased at any store that sells batteries
Meter that can measure AC voltage
System schematic
Note This technical bulletin describes the various motherboards that have been tested and used by
Centroid If your system does not have one of the motherboards outlined in this technical bulletin you may
need to download the motherboard manual to determine where the POWER pins are located and use
technical bulletin 114 as a guideline for setting the BIOS for your motherboard
Procedure
1 Since these are standard PC motherboards they will use either a microATX or an ATX power
supply Verify that approximately 110VAC is at the power supply If it is move onto the next step
If it isn’t use the schematic for that system to determine why there isn’t 110VAC going to the
power supply Some issues could include a bad crimp broken wire bad connection etc
2 Remove the 20/24 pin power connector from the power supply that connects to the motherboard
Power the system Take a paper clip or a pair of needle nose pliers and short the green wire on
the power connector to any of the surrounding black wires If the fan on the power supply starts
spinning let it run for approximately 10 15 minutes If the fan on the power supply stops spinning
or never spins the power supply is bad and will need to be replaced If it continues to spin move
onto the next step
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3 Since these are standard PC motherboards that are installed in your desktop PCs the default
operation is for the operator to push a button to turn the PC on The Centroid controls are not
designed with that push button and the BIOS settings are set in such a way that it will not look for
that push button If the CMOS battery dies the BIOS settings go back to factory default which
would tell the motherboard to turn on as soon as that push button was pressed There are a
group of pins on the motherboard that are used to connect the items that are located on the front
of a desktop PC The POWER pins are part of that grouping Below are pictures from various
motherboards that Centroid has used that illustrate the location of that group of pins Once you
have found the POWER pins power the system and short those two pins for a split second If
your system starts booting the CMOS battery will need to be replaced It is typically a CR2032
battery that can be found in any store that sells batteries After the CMOS battery has been
replaced the POWER pins will need to be shorted again Once the system starts to boot press
the DEL button to get into the BIOS menu and reset the BIOS settings according to technical
bulletin 114 If the system does not start to boot after shorting the power pins on the
motherboard the motherboard is bad and will need to be replaced
MSI M6368
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MSI P4MAM MS 6787
PM8M V
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M4N68T M
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K8MM3 V
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K9VGM V MS 7253
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K9N6GM V MS 7309
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GA M68M S2P
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GA M68MT S2P
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GA 78LMT S2P
GA F2A55M HD2
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GA H81M S2PV
Document History
Rev3 Created on 2026 02 18 by #495
Rev2 Created on 2015 04 24 by #270
Rev1 Created on 2013 02 21 by #270
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