Freeze when connecting to monitor

I have a 2011 Thunderbolt Macbook Air. I have the old white Mini display adapter to VGA (NOTE, THIS IS NOT THE NEW MINI-DISPLAY TO DVI). Everytime that I plug in the adapter that is connected to my monitor, my macbook air freezes or becomes very very slow. The pinwheel of doom will usually come on and off until you unplug the monitor. Sometimes, my computer will just become very slow, and I will be able to still use it, it just takes a while. I can look at the system prefs pane and see that my monitor is detected with its name. Nothing every shows on my monitor, and it stays asleep. The same thing happens of I try to plug my air into any other VGA device like a home theatre projector or a Television. What is wrong here?

@Jonah-B
If it is Apple branded take it back to Apple.
If it is a 3rd party device you'll have to work with them.
Apple is usually a more stable environment because the number of variables are smaller. When you go to test a Mac with Apple branded equipment their QA team usually does a decent job of testing all the current models. This is possible because there are a limited number of current models to test with. It also means that Apple can take shortcuts in implementing new technologies that take other PC manufacturers to work together on to create a standard. PC laptops still ship with VGA on board. Apple has been using mini Display Port for years and is now moving on to Thunderbolt. The PC industry has just started talking about getting rid of VGA to standardize on HDMI as the laptop output of choice.
Start adding in 3rd party connectors connecting to 3rd party devices and it gets complicated in the Apple world.
If you can identify the V7 adapter, the Monitor and the Mac laptop model and year you are using it might help.
V7 is Ingrahm Micro's OEM brand. I would try contacting them for support since you are not likely to be on the only Mac user with a V7 adapter having issues
Technical Support / Customer Service
Your questions concerning V7 Products
Phone: (800) 289-9686
Hours of operation: Monday - Friday: 8:30 am - 8:00 pm EST (excl. Holidays)
E-mail: [email protected]

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http://support.apple.com/kb/ts3219
Symptoms
In rare instances, iTunes may become unresponsive when connecting an iPhone, iPad or iPod touch to your computer. iTunes may become responsive again after you disconnect the device from the computer.
Resolution
Expand All Sections | Collapse All Sections
Follow the steps below to troubleshoot the issue:
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Itunes freezes when connect my ipod

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Sorry for my english, i speak spanish... HELP
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Message was edited by: MoonMan_

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