How do I update firmware for mid 2011 21.5"?

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Level 1

11 points

How do I update firmware for mid 2011 21.5"?

I tried the directions and the link to download it on the Apple support pages, but when I tried to download it said my system wasn't supported. In the requirements it said I need Lion. However I just bought this used. It came with Mavericks and I updated to Yosemite. So I don't have Lion but I am having a problem with the fan on the computer that I am pretty sure is because of the firmware because I already tried everything else and the firmware is way behind (and if it's not the firmware then well I'm at a loss about the noisy fan).

iMac, OS X Yosemite (10.10.2)

Posted on Feb 13, 2015 5:54 PM

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Answer 1

jndupuis1

Level 2

462 points

Feb 13, 2015 6:00 PM in response to Lasey L.

Had a similar issue on my Mac Mini. I did the simple first. NPRAM reset. I let NPRAM cycle more than once. Mac continued to boot then shutdown. I followed up wit an SMC reset. Then powered up. Of course I had to go into presences and readjust settings, but it worked for me.

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Answer 2

Lasey L. Author

Level 1

11 points

Feb 13, 2015 6:10 PM in response to jndupuis1

I already tried all of that 😟

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Answer 3

jndupuis1

Level 2

462 points

Feb 13, 2015 6:19 PM in response to Lasey L.

I figured so. My apology. Is noise due to erratic speed or maybe dirty?

I did notice with my Apple 27" Thunderbolt Display, I reduced the brightness and my fan stopped sounding like a turbo jet when Display got hot. I've a fan both in the Mini and in Display.

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Answer 4

stedman1

Level 10

265,042 points

Feb 13, 2015 6:20 PM in response to Lasey L.

Have you checked?

Runaway applications can shorten battery runtime, affect performance, and increase heat and fan activity - Apple Support

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Answer 5

Lasey L. Author

Level 1

11 points

Feb 13, 2015 6:38 PM in response to jndupuis1

It's not getting hot at all. When it wakes from sleep it is quiet, then the fan gets gradually louder and louder and it doesn't get quieter ever, ever when I quit all the applications. It seems like it's just running with no regulation. I have a feeling it has something to do with the heat sensor and I'll eventually have to open it up to fix the problem, but I would like to try all other options first. And I figure it's probably good to update the firmware anyway whether it's the cause of the problem or not.

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