After changing one of the CPUs, change thermal paste, change CPU position, try with another main board now it seems it finally works!!! I dont know what was the reason hehehehe

The problem with the openfirmware seems to be the keyboard. When I use an old one I can enter OF without problems but I have tried serveral ones and none works well when enter to OF. Extrange...

Well...Im happy to have my MorphOS machine working again.

Thanks for the support mates