what to do when hacked
iMac 10.6.8
Hacker. Am I compromised? Yesterday when trying to find a professional on google, clicked on one site, a page came up, brightly colors praising ISIS, foul language.Tab on top of the page said Hacked By....... I quickly left the page, turned off internet, shut down computer. Then restarted. When desk top up, the Apple notice "checking for software updates" and the thermometer moving. Normally this never comes up unless I hit button to check for updates. If there are updates, Apple posts sign asking to install now or later. So I shut that down, turned off computer for several hours. Now computer seems to be working fine. I just want to be reassured it is not compromised. How to I do that?
iMac, Mac OS X (10.6.8)