My PC's screen resolution changes to lowest when I connect my iPhone-

Does anyone know why my screen resolution changes when I connect my iPhone to my PC and open iTunes?

Hello DarlinDodson,
I'd recommend taking a look through the following article that can help get your MacBook working with your TV again.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Cheers,
Allen

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