@all
Solved the problem, now everything is fine and the amiga boot again..
I don' t really know why it didn't booted before..
The only thing that i did is to add/change a 4way ide elbox interface, modifying the kiklayout-A1200 for adding the interface. switch off the computer for about 30 seconds and then switched on again and.. it booted
Before i had a very simple interface that allow you to use only 2 devices on the standard ide interface of the amiga 1200 using a 3.5'' cable instead of the 2.5'' cable.. maybe was that ?
Thanks to everyone for the help and patience
Thanks to the Friedens for help and patience