What should be done before restoring the operating system to resolve major computer issues?

Before restoring the operating system, it is crucial to transfer contents to an external storage device. This step is essential because restoring the operating system often involves wiping the current system, which can lead to loss of important files, documents, and personal data. By backing up data on an external device, you can ensure that valuable information is not lost during the restoration process.

While contacting technical support, reinstalling applications, or upgrading hardware might be relevant in various scenarios concerning computer issues, they do not directly address the immediate need to protect existing data before a restore. Ensuring data is backed up should always come first, as it secures personal and work-related information against potential loss during the restoration.