Well i had tested an intellimouse explorer 3 but with a usb-->ps2 adaptor and it didnt work . Then i connected my new wireless Logitech multimedia mouse with also an Usb-->ps2 adapter and worked fine. It seems that some weird problem is with the mouses that are both usb, ps2 compatible . So finally i have put a cheapo ps2 mouse and all works fine now . :-D