Hello to all!!!

I have 2 falcon030's and I have the following problem:

After doing a couple of resets, the machine keeps reseting all the time,
and it cannot boot up. It is like I am pressing and releasing the reset button in intervals of 0.5
seconds. This happens as I power up the machine. and it cannot go further. Blank screen and no bootup logo.

Can you help? What might have gone wrong? Something in the reset circuit (capacitor or diode/resistance)???
I have changed psu and ram board but it does not seem to be the case....

Any help would be greatly appreciated....

Thanks in advance,
Panos

P.S. Sorry again that I can't write in French.