Problem appear after installed os x lion

I just bought my iMac three weeks ago. This is my first apple's product and i really love it. But after i installed os x lion, my beautiful machine just turn into nightmare. Everytime i am turning on my iMac, i need to restart it. It is because, some features and hardware/software can't be used. For example my DiGi broadband, speaker, lagging, and the dock also not smooth at all. what should i do now?

Contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

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