If your console is an RGH, check for a pulse light (a small led will blink roughly every 5 seconds inside the back of the console on top of the AV port in phats or under the DVD drive in slims) if this is blinking this is good it is still trying to boot! If it has been a half hour and still it hasn't booted but light is blinking try removing the hard drive (maybe corrupt files)

Make sure you have a video cable plugged in and your TV on the right input!
Did the ring of light on the power button cycle like it always does when it turns on but nothing came on the screen? Your GPU may need a professional reflow/xclamp fix(wnyconsoleservices on skype is a good repairman)

Try another AV Cable or HDMI cable, if HDMI cables aren't working try switching to AV and vice versa if AV isn't working. Also make sure you change the TV input!

boot up your xbox then press eject button to load without plugins
edit your launch ini and use the updated xblstealth plugin

it boots up and everything it just shows the black screen and the green light stops flashing when i take the hard drve off it booots up buetiful its the ini i think my friend gave me his ini that he used to install his and i did boot it up and press my eject button but i tried every thing me and my friend knows maybe i dont have my ini right or plugiins thats why i posted on ttg so someone can help me send me files this is my first time trying to set up stealth so i am new at it maybe send me files walk me thoughit idk

Do you have AIM or Skype?

I'll gladly assist you.

pm my skype to u phoenixMods