Total newbie to this and need help. Just bought 2012 unibody MacBook Pro to convert my cd's to Flac files, so only need internet browsing . Bought the thing off eBay 2.5ghz, 4gb, 500gb hd. Came loaded with sequoia cd drive works but can't browse internet to download db power amp and cover art. Google chrome etc won't work. Plan to upgrade machine & install new battery but would appreciate advice before I do it.