https://www.ifixit.com/Answers/View/231873/HD+that+fit+2009+Mac+Mini+Model+A1283+in+need+7200rpm
SOLVED: HD that fit 2009 Mac Mini Model A1283 in need 7200rpm - Mac Mini Model A1283 - iFixit
here's the replacement guide with links to 7200 listed under relevant parts: Mac mini Model A1283 Hard Drive Replacement You can also consider a SSHD hybrid...
2009 mac mini
https://www.ifixit.com/Answers/View/89692/No+startup+chime-audio+greyed+out+on+late+2009+Mac+mini
No startup chime/audio greyed out on late 2009 Mac mini? - Mac mini Model A1283 - iFixit
On my late 2009 Mac mini (Lion 10.7.4) the audio is randomly greyed out without any startup chime. In System Preferences/Sound/Output, no audio output device...