When I boot into Win7 I see the windows boot up logo, the. I see my mouse and the screen goes black! It goes black in the login screen, I type my password and I hear the login sound but when I press F2 the brightness won't change! Please help!!!

When I boot into Win7 I see the windows boot up logo, the. I see my mouse and the screen goes black! It goes black in the login screen, I type my password and I hear the login sound but when I press F2 the brightness won't change! Please help!!!

Hi Emma,
Thank you for using Apple Support Communities. 
I understand that your Thunderbolt display is just showing a black screen when you boot your computer. The following article should be of help in troubleshooting your display. 
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Cheers, 
Jeff D. 

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