6If Apple Hardware Test detects a problem, it displays an error code. Make a note of the error code before pursuing support options. If Apple Hardware Test doesn’t detect a hardware failure, the problem may be
If this procedure doesn’t work, you can insert the Applications Install DVD that came with your iMac to use Apple Hardware Test. For more information, see the Apple Hardware Test Read Me file on the Applications Install DVD.
Problems with Your Internet Connection
Your iMac has the Network Setup Assistant application to help walk you through setting up an Internet connection. Open System Preferences and click Network. Click the “Assist me” button to open Network Setup Assistant.
If you have trouble with your Internet connection, you can try the steps in this section for your type of connection or you can use Network Diagnostics.
To use Network Diagnostics:
1Choose Apple () > System Preferences.
2Click Network and then click “Assist me.”
3Click Diagnostics to open Network Diagnostics.
4Follow the onscreen instructions.
If Network Diagnostics can’t resolve the problem, there may be a problem with the Internet service provider (ISP) you are trying to connect to, with an external device you are using to connect to your ISP, or with the server you are trying to access. You can try the steps in the following sections.