I use a iMac osx 10.7.5 2 gb hd in my office. Has worked like a dream all these years. The past few months I frequently get this message: YOU ARE NOT CONNECTED TO THE INTERNET ? THIS PAGE CANNOT BE DISPLAYED BECAUSE YOUR COMPUTER IS OFFLINE My computer is not offline. Ever. I then have to wait a few minutes, re launch safari and it works for a couple of hours. Have I and this computer come to the end of the line? Any help or advice would be greatly appreciated.