How do I check my iMac if I believe it could be compromised?
opened email asking to verify PayPal purchase. I don't have a PayPal account but I called the number provided. He led me through a series of steps to access a "cancellation form" but it got so involved I hung up. How can I tell whether computer was compromised?
[Re-Titled by Moderator]
iMac 21.5″