Xbox Audio Video Problem Can Hear Audio but No Video?

Okay well i just recently bought an Xbox 360 Pro Off someone and i plugged in Both the HDMI and Tv Cords and i turn it on And put it on The Input for the game and I can Only Hear it loading up but theres no video i tried buyin new cords still Same Thing happened, I dont honestly know whats wrong with it and would like some help as in maybe how to fix it or what the problem is and im not sending it to Xbox Cause they wont Fix that Problem for Any less then 100$ and **** that… SO PLEASE SOMEONE HELP ME OUT WITH THIS and thank you oh so much

Suggestion:

INSIDE the xbox could be the gpu has over heated and the crappy clamps caused the mobo to warp and short out the graphics. they do sell gpus by themselves and it is possible to do it yourself and for under 100 bucks… but its a very intensive process and you hafta basically be a computer neurovascular surgeon to pull it off successfully. if i had the money and the time, yeah… id try it.otherwise you kinna just got conned into buying a brick. mebbe a gamestop will take it…worth a shot and some research.

Tagged as: older xbox hear sound no video, original xbox i hear sound no video, whats wrong with xbox when theres audoi but no video, when i try to play original xbox games i can only hear it, xbox ORIG sound but no video