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After a power outage last night, when my iMac was running, it was obviously suddenly powered down.
This morning I turned it on and had to wait a considerable time for it the complete its restart process (40minutes). When I logged on I noticed that the fans are running at full blast. Why has this happened and how do I reset the fans to run at their correct speed?
Is this a good question?
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I’m suspecting something gave out from the surge.
Did you have the system plugged into a good surge suppressor or a UPS? Both help protect your system from damage from surges and in the case of the UPS it can back fill low voltage condition (not all UPS’s do this).
Can you run this app to see whats happening with the fans TG Pro
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Hi Dan, I do have surge suppression built-in to the extension lead so I’m hoping that worked and there isn’t any damage. Upon reading other Q&A’s in the forum I’m thinking it could be related to PRAM and or SMC, but I'm a little resistant to trying the resolution options out without others saying its fine to follow and won’t do any harm.
Just been looking at TG Pro and down loaded a free trial copy but it doesn’t include the fan or temperature options which are available in the PRO version
But if you think its worth it I’d give it a go and purchase it.
Hi Dan, I bit the bullet and followed a process which was;
Shutdown the iMac
Remove power plug from iMac
Press and hold On/Off button for 5 seconds
Re-install power plug into iMac
Press on/off button to restart iMac
That cleared my problem
Many thanks for your help on this issue
Best regards
Well, I'm happy things cleared up! Basically you did a SMC reset.
TG Pro is for monitoring your temps & fans status. I use it on all my systems to keep an eye on things. I do recommend it. Over-riding the fans either way is not really a smart thing. Sometimes the computer is smarter than the human ;-} Its trying to tell us it either needs cleaning (dust and maybe the thermal paste).
Hi Dan
Many many thanks for your advice and help on this matter it was helpful and wise advice and gratefully received
Best regards
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4 Comments
What is your exact model? Apple has many quite a few different versions of the 21.5" iMac's
by Dan
Hi, Firstly many thanks for getting back to me so quickly.
Im a bit of a Clutts when it comes to the iMac. Where do I find out what model it is? I have the serial number Wil that do?
by Mike Bermingham
Hi Just looked up serial No. so I was prepared and the EMC No. (2428) was there. Does that help?
by Mike Bermingham
That does, Great!
by Dan