If okay, turn the extensions on one by one until you figure out what extension is causing the problem. Go to Safari Preferences/Extensions and turn all extensions off. Select Library./Caches//Cache.db and move it to the trash.

That should make your user library folder visible in your user/home folder. When the View options opens, check вЂ™Show Library FolderвЂ™. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. Go to Finder and select your user/home folder. Doing this may cause some sites to no longer recognize your computer as one that has visited the web site. You can also try try Safari/Clear HistoryвЂ¦. Then try Safari/History/Show History and delete all history items. Safari/Preferences/Advanced - enable the Develop menu, then go there and Empty Caches. What OS and Safari version are you using? You will note in my above example, that the IP address for is 23.55.164.22ДЄgain, we are looking for similar results, all packets sent and received without errors. If you get any or all packets lost, try the Ping again, but this time use the site's IP address instead. Leave the 'Send only 3 pings' option as is.ДЇor example, I just ran a Ping for and got the following results:ДЇor a successful Ping, all three packets should be transmitted and received without any packet loss.

Enter the URL for one of the problematic websites.

We will continue using the Network Utility for this test.

High error counts would indicate an issue with the network connection. These should be zero or very close to zero.

The other area of interest will be under 'Transfer Statistics,' specifically the 'Send Errors' & 'Recv Errors' values.

This should be 1 Gbit/s for Ethernet for an iMac that came out since mid-2005. One item to note: Link Speed - This is the maximum potential bandwidth of the connection.

Once the interface is selected, the network status info will be presented under 'Interface Information'.

Most likely, it will either be Ethernet or Wi-Fi

Under 'Select a network interface for information' select the method that your iMac is connected to the network.

On the System Information menu bar, select Window > Network Utility > Click on the Info tab if not already selected.

Click on the Apple logo in the OS X menu bar > Select 'About This Mac' > Select 'System Report.'.

I am going to assume that it is running OS X El Capitan. To start, let's verify your current network connectivity with your iMac. I can help you with at least the networking part to see if we can rule it out as the reason your iMac is having issues. Typically, when you are having issues accessing websites and email, DNS is the main culprit.

Mac os safari not working