My friend has recently been having troubles with his Xbox, I figured I'd help him out. Its also posted over at teamxbox.com:

X-Box Problem stated as below:
I have recently gotten in a X-Box that I was asked to look at. I was wondering if you guys had any clue at all what could be wrong. This is what happens.
1st push (Power button): It runs for a little tiny bit flashes the normal green light then shuts off.
2nd push (Power button): It runs once again for a little tiny while flashes the normal green and shuts off again.
3rd push (Power button): This time it will stay on but if you have the TV plug into towards the tv it flashes a Green then quickly switches to a flashing of "red/Orange". If you donot have the tv adapter pluged in you get a "green/Orange"]

I was just wondering if anyone knew anything about this. I mean any information you could give would be greatly appreciated. I am just wondering what it mean or what its doing. And anyways to fix it. If you guys have ANY information on it pleaze post below. Thankz