Thank you for your response, but it doesn't seems to resolve my problem.
I resetted the PRAM and SMC, and make mousse as a favorite.
But there is a little better connection : instead of staying connected 3 seconds to my computer, it stay 20 to 30 seconds...I'm borring with this situation and i bought a PC mousse connected to my mac on a USB port. My first experience with a Mac computer is a little disappointing.
If you have got an another idea, thanks to leave me another message !