RT_Productions that is a very difficult question to answer since we do not know what this noise is or what that behavior really sounds and looks like. All of it will depend on your skills, your tools and the price for the iMac.
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The PSU would always be my prime suspects on those.
RT_Productions that is a very difficult question to answer since we do not know what this noise is or what that behavior really sounds and looks like. All of it will depend on your skills, your tools and the price for the iMac.