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When I switch on my iMac (10.7.5, serial number W8744BZUX86)

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the fan comes on, very...
the fan comes on, very loudly. This is a recurring problem, and I remember that the last time I called, I was given instructions to turn on, then re-boot, holding down a couple of keys. Could you advise me which keys (assuming I have remembered this correctly)?... Read full answer
When I switch on my iMac (10.7.5, serial number W8744BZUX86) the fan comes on, very loudly. This is a recurring problem, and I remember that the last time I called, I was given instructions to turn on, then re-boot, holding down a couple of keys. Could you advise me which keys (assuming I have remembered this correctly)?
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Answered in 5 minutes by:
12/28/2012
Mike
Mike, Mac Medic
Category: Mac
Satisfied Customers: 9,021
Experience: Over 20 years IT experience with Apple computers in publishing, marketing and design.
Verified
Probably this procedure correct?

Resetting the SMC & PRAM for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
6. Press and hold the Command-Option-P-R keys before the gray screen appears.
7. Hold the keys down until the computer restarts.
8. Release the keys.
Mike
Mike, Mac Medic
Category: Mac
Satisfied Customers: 9,021
Experience: Over 20 years IT experience with Apple computers in publishing, marketing and design.
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