External LCD goes black when connecting iPhone

When I connect my iPhone to my Macbook, the external 22" display goes black for about a second, then the picture comes back.
When I recieve a call or an sms or the phone just searches for a signal, (the buzzing sound in speakers) the screen also goes black.

I have a Windows NTFS partion visible on my desktop. When I press the button to hide harddrives on the desktop in the settings, only the Macintosh HD disappears, the windows partion named "Unnamed" still remains there.
Having reinstalled windows a couple of times through bootcamp, I discovered that this only happens if I make a new partion while the harddrives are hidden on the desktop.
If i make a new partion when the harddrives AREN'T hidden from the desktop, then both the Macintosh HD and the Unnamed disk disappears when I press the "Hide harddrives" button in Finder settings.

How do I solve the iPhone problem?
And how do I make my windows partion hidden without deleting it and making a new one when the harddrives aren't hidden from the desktop?
Any help is appreciated

 

Screen still goes black even though the iPhone isn't connected to the computers USB port.
Must be that the screen isn't grounded.

Still got the problem with the harddrive visibility..