On Dec 20, 5:21 pm, Bill Spencer <wspen...@jhu.edu> wrote: > On Tuesday, December 20, 2011 1:51:29 AM UTC-5, Dan wrote: > > > Could be the drive. Just as likely to be the fans running at a > > > higher than normal speed because there's 5 years worth of dust > > bunnies growin in there. > > Just had the thing cleaned out a couple of months back because of what > proved to be improperly-seated memory, so it's probably still OK in that > regard. The whine sound stops as soon as the thing goes to sleep, and > starts up as soon as it awakens.
Here is the hint to do a little sleuthing. Hard drive whine should remain fairly constant. Fan whine should change from silent to strong as fan speeds vary. Note the placement of fans and other components in various iMac models, all fairly standard. In the limited sampling of three models with the iMac Core Duo 1.8GHz (late 2006) in the middle, there seem to be three fans in prominence. Do some heavy work with the optical drive, stress the CPU likewise, and listen. Also, a crude stethoscope applied to the back of the machine may help locate the source of the whine. Your machine seems to be the one in the center of this list, the top one being the first "aluminum" and bottom one being preceding G5: http://www.kodawarisan.com/imac_2007_mid/imac_2007_mid_03.html http://www.kodawarisan.com/imac_intel/imac_intel001.html http://www.kodawarisan.com/imacg5_isight/imacg501i.html Question for iMac techs: Could there be more than the three fans visible in the photos? Could one be always on? Al Poulin -- You received this message because you are a member of the iMac Group, a group for those using Apple iMacs and eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to imaclist@googlegroups.com To leave this group, send email to imaclist+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/imaclist
