Mini will begin to boot, then shut down.

Hello all,
My 8 month old mac mini has just developed this issue: It begins to boot, displays the Apple Logo, the spinning circle and then an empty progress bar underneath the circle. Nothing ever fills the bar, it disappears and then the machine turn off completely.
This happens every time I try to boot it up - even after unplugging it for a while.
I am baffled!
Thanks in advance,
Stu

It sounds like your Mini is either trying to startup in safe boot mode or it think it's supposed to be installing a firmware update.
I would suggest booting up the computer without any devices connected -- except for the monitor and the power cord.
If the problem is being triggered by an external device, the system should boot up properly. (You can then connect a mouse and keyboard to control the computer -- even while it's on.)

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Mini will begin to boot, then shut down.

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