Bouche, you just bought an xbox and you get the three red rings? I'd say return it and exchange it for a different one. There will always be defective hardware, granted that the 360 has a far from stellar record.
With regards to the new models not getting the red ring, I think that it is important to differentiate newly built models with the HDMI and those that have been refurbished. I just bought an xbox 2 weeks ago and I am hoping that the newer models are more reliable.