Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
How do you have your xbox 360 connected.. Via an HDMI cord, or using one of the RCA adapters with red , yellow and white connectors?
Also, what current input is your tv on?
Does it say no signal in blue on the screen?
Or, what does it say on the TV when you have the XBOX turned on?
Also, I need you to check and see right now what Input you have the TV on.. And then, verify that the xbox is connected to the same Input ports on the back that t he TV input is currently set to.
Ahh.. if you see no signal in blue.. Thats an issue.
Can you check this picture.. http://www.tildee.com/uploads/25-10-2013/8261D9F9-DEA3-438D-925E-DF63C6490034.jpg
try pushing the switch in one direction, then wait about 20 seconds.. Does anything show up? If not, flip it back to the other direction, and see if anything shows up.
Can you send me a picture of your connector then so I can get an idea of the model we are dealing with, thank you.
This is either an issue with your cable..
Or, with the video card on the xbox.. Do you know some-one else who has an xbox that you could test your xbox using their working video cable? That will save us some time and money, as Id hate to purchase another cable if its not actually the cable thats the issue.
And as far as repairing the xbox if its not the cable, that repair can get a bit in depth, so we want to be 100% certain that we try a different cable BEFORE we try anything else.
Hello, I never heard back from you after you viewed my response. Did you still need help with this issue?
It could be very old.. But there are still fixes available.
Before we try and b ake the xbox in the over ( seriously, that can be a fix for video issues when done correctly )
Would you be able to try your xbox with someone elses video cable? That would tell us right off the bat, if this is just an issue with your cable set.. Or, if its an internal issue.
For instance, you can get a replacement cable set here for under 10$.. http://amzn.to/2cakjYV
If we can rule out the cable.. T hen we can discuss other repairs you can do that wont cost $$$, just time.
So you did try a brand new and known working cable set?
Have you tried holding down the y button and right trigger when you turn the machine on, ( on the player one controller )