Thank You, I cleaned the unuseful files and things go better now.
Only a trouble remains, I dealt with also some time ago when I was unable to use the Logitech mouse connected through a receiver to the Mac. Keyboard worked but the mouse didn't. I solved everything with the Logitech Control Center app. Now, if I boot with Clover everything is ok. On the contrary, booting with OC 0.6.3 and VoodooPS2Controller.kext rel. 2.1.8 the keyboard works but the mouse doesn't (pointer moves on the screen but does nothing, so I have to connect a cable optical mouse). LCC doesn't see any device to configure. Is there any specific quirk to setup? What do I miss?