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Hmmm
If the red light doesn't come on that generally means the power isn't getting into the motherboard.....
This could be as simple as a duff connection between the power lead and the power socket..
Are you sure you have a 2.1mm connector on the power lead...there are two readily available sizes a 2.1 and 2.5mm The 2.5 also seems to fit but it doesn't give a good reliable connection to the central pin on the socket.
If you look (from the outside) into the power socket on the mount you'll see a central "pin" - if you look carefully you'll see it's actually a split pin...using a small instrument screwdriver you should be able to gently prise the pin and make it a bit bigger - this may give you a better connection.
A 2A 12V mains transformer from JayCar etc with the correct socket will definately ensure that the voltage is above 11.8V - which seems to be the drop out voltage for these mounts.
Summary:
No red light - no power getting in.....
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