Power supply

Im sorry to say but it sounds like the PSU has died this could be for many reasons... Overheating, Power Surge etc

Are you still under warranty? If so call up MS and they should be able to either send you a new one or some how fix the problem.

If not ebay would be your best next thing.

it says its supposed to have 320 gb its a limited addition xbox from modern warfare 3 it has 290 gb.

the sockets arent a problem im worried about the voltage

Hey there mate!

If your power supply has a flashing orange light, it may need to be replaced. Try the following solutions:

1.Try plugging your console’s power supply into a different electrical outlet. Do not use a surge protector.

2.If the power supply light is solid red or flashing orange, unplug the power supply and let it cool for 30 minutes. Then, plug the power supply back into the outlet.

If your power supply light is still flashing orange, solid red, or unlit, your power supply needs to be replaced. You can Order a replacement Xbox 360 power supply from our Xbox Online Service Center. Console registration is required to replace the power
supply under warranty (the power supply warranty is the same as your console warranty).

Here is a link for more info!

http://support.xbox.com/en-US/xbox-360/console-power/check-power-supply

I tried to press the eject button twice. It beeps but does not eject, the power bricks color is still orange. When i press the power button the power bricks led becomes green for a sec then it becomes red.

^^^^^Absolutely I can almost guarantee it is a faulty power brick so as onyx said please bring it back and get a new one. Here is a guide for you.

support.xbox.com/.../check-power-supply