Final answer:
To troubleshoot a computer with a security issue, the technician should examine the security logs for unusual activity and run a malware scan to check for infections.
Step-by-step explanation:
Identify the problem: The first step is to identify the problem and its scope. You need to gather information about the symptoms, the affected devices or users, the network topology, and the security policies and protocols in place. When troubleshooting a PC with a suspected security issue, the technician can perform several actions to test theories of probable cause.
One effective strategy is to check the computer's security logs for any unusual activity that could indicate a security breach, such as failed login attempts or unexpected software installations. Another action that could be taken is to perform a malware scan using reputable antivirus software to determine if the computer has been infected with malware, which could be the root cause of the security issue. Both of these actions can provide insight into whether the security issue is related to a breach or malware and help in taking the necessary steps to resolve the problem.