814      iPhone_iPad_Mac_apple

I am having problems with my MAC Lion 10.7.5. I...

I am having problems with my MAC Lion 10.7.5. I am losing contact with some websites and I think I need to update the operating system etc. When I select available updates there are non. I am wondering if the issue is with my graphics and If I need to upgrade to installing the Apple Radeon HD 5770? My current graphics is NVIDIA Ge Force 7300GT256 mb.

I have 8 gb memory and the processor is 2x2.66 ghz dual core intel xeon.

I am not sure what to do and would appreciate the advice. I do not know why I cannot upgrade.

Thanks

最後更新：2017-09-06 21:43:57

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