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I updated from Snow Leopard 10.6.8 to Lion. The OS update process was all right.

I can access the Internet by Firefox, but Safari.
I think my network is all right.

So, I can access the internet from Lion, but I can’t use the Mac App Store, the iTunes Store or update my system.

How can I fix these problems?

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What happens if you go to the App Store? –  Paul Eccles Aug 3 '11 at 12:32
    
it does not have any error information, it stands in loading all the time, but the progress bar does not running. –  LeonPak Aug 3 '11 at 12:43
    
I found a error report about the app store: –  LeonPak Aug 4 '11 at 5:50
    
Yes ... do tell! Was it perchance "No GUID is available. Contact Support for assistance." in red font. I had that on my hackintosh, I deleted my .plist file in /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist –  Paul Eccles Aug 4 '11 at 6:32
    
Do you still need assistance? What did the error report tell you? Have you tried another App Store account to make sure it's not a problem on the servers? –  bmike Aug 9 '11 at 21:12
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1 Answer

Are you running an actual Mac or are you running a Hackintosh?

This is a known Hackintosh issue http://tonymacx86.com/viewtopic.php?f=135&t=23153&start=120

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