i moved the table my imac was on and i accidentally took off the power cable.the imac was on so when i took the cable off it shut off. then i put the cable back and tried to turn it on but nothing happened..it is like dead. any suggestions?
iMac, Mac OS X (10.6.8)
ok it's fixed..when the cable comes off from the body of your imac(and not from the wall) , then you should firstly remove the other part of the cable from the wall(or the place where you get power from) and then reattach it to the body of your imac.put the other part of the cable back into the wall and then turn the imac on. otherwise the capacitor inside your imac gets overcharged and for safety reasons your imac wont start up for 30 to 60 minutes.
You could try an SMC reset:
SMC Reset
I have an iMac which will not power back up for 1.5 to 2.0 hours after I power down the iMac normally and then remove the power cord from the power outlet(on the wall). I took it in the an apple store, we powered it up normally and then shutdown the iMac normally. We then disconnected the power cable. The apple expert could not get my iMac to power up again. He said some hardware is not functioning correctly. Apple is going to replace the power supply and logic board, and if necssary the digital line. I have brought my iMac into the Apple store 3 times to fix this problem, although I recently figured out how to reproduce the problem. Typically after a power outage my iMac would not power up again for several hours. I believe that this problem I have is not unique. I believe it is systemic for many iMacs and Apple does not want to admit it!
Also, there is a small battery or capacitor on the logic board that may need to be replaced, as this has been the cause of a similar issue over many generations of Mac computer hardware. Of course there are other causes of failure, and that is why the help of an expert to troubleshoot and diagnose issues to attempt to resolve them can take time.
And it may not be resolved after the first attempt if the actual problem is deeper than first best educated guess arrived by troubleshooting. Part of some repairs requires replacement of suspect parts, even if they may not be the cause, to eliminate their being within the realm of possibility. A good read is among the original Apple Technical Service Manuals, those aren't often available to the general public. I used one to self-troublehoot an iMac under AppleCare after the nearby 200+ miles one-way distant 'specialist' could not fix my new iMac, four times. So I am a bit cool on newer Macs; the way I see it one new headache lasting 10 months and requiring 3,000 miles travel, to not be resolved by experts (and under warranty, so I can't touch it!?!) is enough.
The best cure for main power failure, is to have a good high quality battery backup system in place with automatic voltage regulation, that also works as a power filter; and can step in to isolate the Mac from mains high-or-low power fluctuation. This can save many products from bad power sources; do not rely on these, either. Make copies of your work ahead of time. This saves your computer from issues you can prevent.
PS: my Macs seldom are shut off, for up to 11 months, some of mine only get to sleep when not in use. When the main power goes offline, during a storm or extended utility failure of their own making, I will have to shut them off as a choice. There is software in the UPS unit that can help shut down automatically, and that is a choice, too. I usually find their software problematic on occasion; and the battery backup is not very long in duration, so one with a few hours runtime and a method of rationing the power if you are present when the mains fail, is helpful in performing a normal shutdown after a power failure.
Good luck & happy computing! 🙂
imac wont start up after power failure
