Keep the hard drive in the back of your mind. My CC has a hard drive that appears to be failing based on the noises it is making.
Apple seemed to use Quantum ProDrive EPS series in the Color Classics. These drives were decent performers but seem to conk out after 15 years. I can tell by the access noise that I have an EPS in mine and I wouldn't be surprised if you have one of these drives in yours if there is a failure.
Do what Apostrophe suggested first to rule out a software problem. As he said, it's likely the cause, especially if the drive hasn't had a clean install in some time. (I like to perform clean installs every two years if the machine is used daily so I can reformat the drive and start with a fresh, unabused OS install at the same time; for computers used irregularly I usually stretch it to three and a half years).
Apple seemed to use Quantum ProDrive EPS series in the Color Classics. These drives were decent performers but seem to conk out after 15 years. I can tell by the access noise that I have an EPS in mine and I wouldn't be surprised if you have one of these drives in yours if there is a failure.
Do what Apostrophe suggested first to rule out a software problem. As he said, it's likely the cause, especially if the drive hasn't had a clean install in some time. (I like to perform clean installs every two years if the machine is used daily so I can reformat the drive and start with a fresh, unabused OS install at the same time; for computers used irregularly I usually stretch it to three and a half years).