iMac making rattliing noise, can I fix?

  Coby Burns 19:12 15 Nov 2016

My iMac is making a noise like a loose fan, once in a while it squeals, high enough to upset my dog. I read that performing an Apple Hardware test will tell me what could potentially be wrong. Any suggestions before I take it to a Mac store for evaluation?

  Coby Burns 19:14 15 Nov 2016

My iMac is a 2009 21.5" 3.06 GHz Core 2 Duo

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