Good Morning Ronni I have previously reset the SMC the first time the problem occurred. As it is so infrequent I have not bothered again but will try your suggestions if/when it happens again. Frequency has only been about every 4-6 weeks and the number of occurrences has only been about 3 or 4. My query was really only a general one to see if anyone thought this was an indication of possible future problems. Hopefully, running the extended hardware test should indicate this and I will run it if the problem returns.
Many thanks for your help. Barry On 15/05/2012, at 9:29 AM, Ronda Brown wrote: > Hi Barry, > > Reset the SMC (System Management Controller) first. > The SMC controls the operation of the fans and this may clear a problem if it > is coming from there. > > 1. Shut down the computer. > 2. Unplug the computer's power cord and all peripherals. > 3. Press and hold the power button for 5 seconds. > 4. Release the power button. > 5. Attach the computers power cable. > 6. Press the power button to turn on the computer. > > If that does not fix the problem. > Run the Apple Hardware Test in 'Extended' mode and see what kind of error it > may pick up. > Apple Hardware Test is included on the DVDs that are shipped with some Macs, > or you can run AHT following the instructions at this link: > > <http://support.apple.com/kb/ht1509> > > > Cheers, > Ronni > > 17" MacBook Pro 2.3GHz Quad-Core i7 “Thunderbolt" > 2.3GHz / 8GB / 750GB @ 7200rpm HD > > OS X 10.7.4 Lion > Windows 7 Ultimate (under sufferance) > > On 15/05/2012, at 7:42 AM, Barry Sexstone wrote: > >> Dear All >> >> Occasionally I find the fans on my iMac running fast. So far this has only >> been in the morning and the machine has been idle overnight and the ambient >> temperature low so no obvious cause. >> Shutting down and waiting a short time corrects the fan speed but I am >> wondering if this behaviour is an indication of problems to come. >> Any wise thoughts? >> >> Regards >> >> Barry >> >> >> iMac 10,1 >> Intel Core 2 Duo 3.06 GHz >> 12GB RAM >> 1.0 TB HD >> OS X 10.7.4 >> > > > > > > > > > > > > > > > > > > > -- The WA Macintosh User Group Mailing List -- > Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> > Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> > Settings & Unsubscribe - > <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug> -- The WA Macintosh User Group Mailing List -- Archives - <http://www.wamug.org.au/mailinglist/archives.shtml> Guidelines - <http://www.wamug.org.au/mailinglist/guidelines.shtml> Settings & Unsubscribe - <http://lists.wamug.org.au/listinfo/wamug.org.au-wamug>
