Chosen Solution
The Cube has some parts drop down( sheetmetal, screw ring and screw) when I install the AirPort Card last week. It just hold the power on in a few seconds to off and restart continuously, it can not enter the OS platform. You can see the parts’ picture at this website. http://mac.hk/appletalk/download/file.ph… Thank regards
I would open it up, and look for any more loose parts, that may be shorting something out, and causing the cube to restart. If this doesn’t work, then there is a problem with the power brick, or motherboard/cpu. Also, try removing the airport card you installed.
Try Flashing the Image…
