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[Heimdall]

To get a visible screen back, plug in your old composite cable.

What did you do to increase the resolution? Once you can describe what you did originally (that didn't work) it will be easier to help you do it properly.

[zeke9090]

It didnt work to plug in the composite cable.

What I did was to plug in the new, component cable. Then I got a normal picture, just like with the composite or scart cable. Then I launched Xbox Media Player, or Xbox Media Center (one of them) and changed the resolution to a higher setting. When I confirmed the settings and the console changed the resolution (i did it to get better picture on my flat screen), the screen went black/blue, which I believe is a result of the signal either not being compatible with the TV (unlikely, tried on many different TVs, flatscreens and old ones), or not compatible with the xbox.

Ask if you need anything else.