okey, I appreciate your quick-answers guys..
Here is the story:
*when I boot , it blinks one time on the hard drive led, one minute later it blinks again on the same led , and shuts down (seems like it's searching for the update wich must be normally on the hard drive but doesn't find it, it does the same with a new hard drive)
*when i press the on/off button, it only beep once and shuts off immediately. no way to make a reset.
*I remember it did brick up passing from the 2.4 to the 2.5 (it was the one before the recovery mode).
I ll try to install the modchip asap, please dont hesitate to give me advice if there are other things.
thanks a lot