Turns on then immediate turn off

I bought an xbox off of ebay and the seller sent me a video. in the video the seller presses the powerbutton. It does its boot chime and then never boots any further… Can someone help me identify the problem and tell me if its board level or psu. The seller claims that they bought it off of someone and the original owner dropped it and it never worked properly again. anyone input would be super helpful. If you need the video just email me at andrew.mariona@gmail.com