IMac won't turn on after resetting SMC

Recently my 2011 iMac starts uttering strange noise even if the fan speed is low so I decided to reset SMC this morning. However, after unplugging for 15 sec and plug again. it just won't start! No matter how I pressed the power button, there is no reaction coming from my iMac. I tried to long press for 10 more seconds, re-unplug and plug in, and tried another socket on the wall but in vain. Do you have other ideas 'cause I have not backup my data and hope to grab something output before sending it to the APPLE store. Thanks.

If you get no video or audio at all and you have confirmed it's not the power source or power cord then that indicates your power supply may have failed.

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Read and follow all the steps.
If you find yourself at Step 6 determine if you can start the Mac in "Safe Mode":
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode
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IMac won't turn on after power cut

When my iMac is unexpectedly turned off, ether at the wall or during a power cut, it won't then come back on immediately. Sometimes it will come back on after an hour, sometimes after a couple of days. Anyone know why this is? There is no logic to it. I've tried all the trouble shooting stuff; the resetting SMC for example. And I've got a surge protector. I've also taken it into an Apple store, a round trip of 3 hours, twice already over the past couple of months. But after doing some diagnostic tests on it they can find nothing wrong. Also, when they go to turn it on, it fires up immediately. I was told that unless they experience the problem themselves they can't do anything. Which means I'm forever taking it in to them, during this problem, on the off chance it may still be a problem when I get there. It's very infuriating. Help!!!

Great advice. And I'll definitely do that - need to get my Mac back on and working before that however.

TS1538 iPod touch won't turn on after resetting

I started by resetting my iPod touch 3rd generation, and now it won't turn on at all. I've let it charge and have tried literally everything I can find on the internet,, but nothing has got it to turn back on. Someone PLEASE help me...

Try:
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- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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Apple Retail Store - Genius Bar

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My iMac won't turn on after power flickered on and off.Is there a virus affecting it or is something ele wrong?

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Try an SMC reset - sometimes works:
SMC Reset
Shut down the computer.
Unplug the computer’s power cord and disconnect peripherals (printers/external hard disks, etc. but not keyboard or mouse).
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.

Old imac won't turn on after a week of inactivity

Hello,
I'm aware this question was answered elsewhere on this forum but the issue there seemed to be that the imac had been moved and/or jolted. In my case, I went to New York for a week and when I came home the imac just wouldn't turn on. I've bought a new power cable, checked all the connections, disconnected peripherals, tried command/control/power etc. Nothing. I've even tried starting from a Norton utilities disk.
There were no date/time issues the last time I used it but is it possible this could be a battery problem? Any thoughts why it might have just stopped after a week of not using it? (I normally have the computer on every day).
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Thanks,
KH
Imac G3 Mac OS 9.0.x Slot loading CD, Bondi blue

Hi dancebaby,
Thanks for visiting Apple Support Communities.
Start with these troubleshooting steps if your iPhone does not turn on:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
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If the display turns on, go to step 4.
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Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
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2008 iMac won't turn on after Mountain Lion installation

I have a 2008 iMac with 6GB of RAM that was running on OS X 10.6.8 perfectly. Tonight I upgraded it to Mountain Lion. After the installation, my machine was running slower and a little choppy, especially when first opening programs, even though it meets all the requirements for Mountain Lion. After about an hour or two of running like this, I was standing away from the computer for a minute when I saw a flash come from the monitor. I went to it and the screen was black. I thought maybe it had went to sleep, but nope! It was completely off and would not turn back on. No lights or sounds come on at all. There was no power outage or anything, and all other devices plugged into the same surge protector were working fine. I tried plugging it into another outlet and still had no luck.
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Welcome to Apple Support Communities
It's quite possible that the power supply failed. The failure is difficult to be related with OS X Mountain Lion, so I would discard that. In some cases, it's normal that you experience slowness after installing a new OS X version because Spotlight indexes the hard drive.
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IMac won't turn on after scheduled shut down

Hi, hope someone here can help me!
I have a 20" 2006 iMac. While it was still under warranty, it repeatedly froze, and eventually when I turned it on the screen remained blank although I could hear that the hard drive was at least trying to get started. I got it repaired (new logic board, new screen), but now I am having some of the other difficulties mentioned here, where the screen freezes when using graphic intense software, including 3D games. Sometimes, it works fine for hours, others less than 2 minutes. I used to keep it on all the time, with energy saver set to go to sleep when possible. I've found, though that the graphics problems are less likely to happen if it has been off at least overnight, so I set up the schedule for it to turn itself off in the small hours. The problem is, when I go to turn it back on, it won't come on unless i pull out the power cable from the back of it and put it back in again. Any ideas what's causing this? And any ideas on what I can do to fix it?
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If you went through Apple you do get one free phone call to an Apple tech.
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IMAC won't turn on after installing Magic Mouse

Hello
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I'm afraid so. Still. I wonder how it just happened the exact moment I installed the magic Mouse. Thought it could be a compatibility issue
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IMac 5K won't turn on after 3 weeks.

I have used only for 3 weeks.
Suddenly, iMac screen turned to black.
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I have been having exactly the same problem as Mhuntet11.
My 2010 i3 iMac will not turn on after losing power, which includes being unplugged or the power being turned off.
It has happened to me 4 times now. In each case - nothing will get it started. But on each occasion - about 2 days after the power cut - the iMac will start up again, good as new.
I have also experienced the other thing that Mhuntet11 said:
"when it won't turn on I plug it into a different outlet and if it does turn on I can unplug it and put it back in the original outlet and it works fine"
Yep - once, after 2 days of trying every power point in the house, I finally started up in the kitchen. Not very practical, so I bit the bullet and powered it down again and moved it back to the office. It stared fine.
Does this sound like a fault that should be serviced? Or is there some re-set technique I do not know about.
I have followed the SMC reset procedure and it does nothing

IMac 2ghz won't turn on after power loss

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I have been having exactly the same problem as Mhuntet11.
My 2010 i3 iMac will not turn on after losing power, which includes being unplugged or the power being turned off.
It has happened to me 4 times now. In each case - nothing will get it started. But on each occasion - about 2 days after the power cut - the iMac will start up again, good as new.
I have also experienced the other thing that Mhuntet11 said:
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I have followed the SMC reset procedure and it does nothing

Imac dead and won't turn on after lightning storm

Lightning fried my mac; its dead and won't turn on, in spite of having a surge protector; my question is what part is likely damaged; and what does a repair cost without Apple Care.?
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Hi rasperryaddiction!
I was wondering if you've tried resetting the SMC (support.apple.com/kb/HT3964). It's very simple to try before considering having the computer repaired. If it really doesn't turn on after resetting the SMC, then contact any Apple Authorized Service Provider or and Apple store near you. Tell them what happened to check if they can give you a quote or something buy, they might ask you to bring it in to confirm the issue. It really does depend on which part was affected.

IMac won't turn on after resetting SMC

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