6.5 Determine if problem is hardware, software, or virus related
Network server problems can be caused by faulty hardware, misconfigured or poorly written software, or computer viruses.
Computer viruses cause strange behavior in a network server. Some viruses might act like a hardware or software failure. If after checking all the hardware components using normal troubleshooting techniques, there still appears to be a problem with the hardware, it could very easily be a computer virus causing the problem.
Good troubleshooting techniques dictate that you should update the virus signature file and run virus-scan software as a standard part of troubleshooting.