My xbox 360 slim will start up and try to load but goes to an inner circle green light.
If you're using HDMI to connect, make sure the TV is on the correct input as the console will 'wait' for a valid signal before powering up fully (on some TV's).
Also, if you have the 6 wires (3 reg., 3 hd) make sure that on the part that goes inside the xbox it is turned on tv (only white red and white plugged in) or hd (with all 6 plugged in)
Also check the colour of the Power Adapter when you have powered up the x360.
Here is a link to troubleshoot the power adapter based on the colour of the light on it:
Hope this helps
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