[Andre Knecht]

It is unclear whether you have access to the documentation that should accompany your system.

If you don’t, you can (and should) download it all from Digidesign’s web site. Be sure to download the documentation for the version of the ProTools software currently installed on your system.

With documentation at hand, follow the steps outlined in the “Getting Started” document and — if applicable (read it to find out) — the “Expanded Systems Guide.”

To address your specific issue…

You were given bad a advice when told to visit your System Preferences’ Sound panel (obviously by someone who doesn’t know ProTools).

In order to function properly, ProTools needs to have its Inputs and Outputs “defined” in the software’s “Hardware Setup,” and “I/O Setup” windows, both. If unclear, read the documentation’s chapters about the above. (Note that the .pdf versions of every Digidesign manual is searcheable, making their use very, very efficient.)

Lastly…

As a newbie (your words, but your use of terminology makes it clear) you face a rather steep learning curve. Consider hiring someone locally to at least get you started — initial steps are always the hardest and it’s a whole lot less frustrating to learn things with a working system at hand.

IHTH.