Share your experience!
Translation via Google Translate:
My Z5 does not connect to my laptop via USB (Companion)
Mi Z5 no se conecta con mi laptop via USB (Companiom)
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Hello @Mc73 
Welcome to the community! Since this is a user based global forum, we use english. By doing so, we can help you in a faster way! 
About your problem, can you tell me if you are using PC Companion or Xperia Companion?
Es Xperia companion
Did you tried with a different USB cable?
Are you using a Windows or Mac PC? Can you tell me in which version?
Can you tell me if the phone is detected by the PC when plugged-in?
Hola
Tengo Windows 8.1
Cuando conecto mi Z5 mediante el cable USB la Laptop no lo detecta
Hello
I have Windows 8.1
When I connect my Z5 via the USB cable, the Laptop does not detect it
GT
Hi @Mc02
Since this is a global user based forum, we use english! By doing so, we can help you in a faster way!
About the problem: did you try or can you try connecting to another computer?