Imac turning on itself and shutting down randomly

My 2011 iMac started having this weird problem today. Basically, when i turned it off in the morning and left for work, it started turning itself on and off multiple times while i was away. When i got home, I tried turning it off, and it would turn itself on after anywhere between 1-2mins.
The boot screen shows up and i would get the booting sound, then it would restart itself and do the same thing over again.
I unplugged the power and waited for a while, then the imac turned on correctly, but as soon as i set it to sleep, it would fail to wake up. Now i can't even switch it on; the keyboard and mouse would lightup(third party ones) but nothing shows up on the screen and no boot sound. 2 seconds later the lights go off and it would try to restart again.
Again, I have the 2011 i5 imac, with a samsung 830 SSD installed not long ago. Please help!

holding D doesn't work, the computer just boots up for 2 seconds, you can hear the fans turn on, but shut itself off right after that and tries to boot up again.
I installed the SSD like 6months ago too, if there was something that i forgot to connect back it should had happened long time ago no?

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Morning Clementine Lin,
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Imac shuts down, randomly, all the time

So my imac shuts down randomly all the time, after it turns itself off, u need to unplug it for ages, then it will restart (way longer than it should to reset smc). Even in target mode,
Even stranger is it logs a console message stating, system must shutdown now, shutting down....
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I've experiencing the same problem.
If there is a power failure (or the power line gets disconect) I have to unplug everything from the back of the computer and wait for hours till I can turn it back on.
Recently it started to turn itself off..... and then I have to wait for several hours till I can get it to work again..... any tips on how to solve this?

[HELP] iMac shuts down randomly

I bought my 20-inch iMac back in September, and recently my iMac has been acting strangely.
It will shut down itself randomly, and it's hard to predict when it will shut down.
It shut down yesterday after I got out of shower, and it shut down today after finishing my dinner. I've been trying to use process of elimination to figure what's the root of problem, but it is not as easy as it seems.
What I have known so far is that, the iMac never shuts down when I'm using it, it always happens when I am not around, and there is no one present while I was away so it has to be shutting down by itself. My iMac wasn't overheating either since it's idling while I was away.
Although the iMac did shut down while I was using Boot Camp before. However, after I upgraded to Leopard, my iMac, so far, has not shut down itself randomly while using Boot Camp.
P.S. I leave my iMac on all the time, and I was gone for Thanksgiving for 4 days. Surprisingly, the iMac was still on when I got back from the Thanksgiving break.
After doing some research, I come out of 2 possibilities that cause this problem.
1st. It's a faulty iMac that I bought.
2nd. The way I have the iMac's power cord connects to the outlet using a 5-Outlet powerstrip, which does not produce enough voltage for iMac.
There are probably more than just these 2 possibilities, I have not yet tried connecting the power cord directly to the outlet since the power cord is not long enough to reach the outlet. I don't think it's a faulty iMac either because the possibility of getting a faulty iMac is pretty low.
This problem is starting getting on my nerve, and I am not sure if I am the only one out there experiencing this sort of problem.
I am sure there are experts out there have solution for this particular problem.

I have had this issue happen twice that I know of in the last month or so.
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I can't remember how long the computer was on the first time it happened but this time it was only on for a few minutes.
The only thing I could think it might have to do with is either the USB hub that I'm using or one of the external drives that were attached at the time.
They were being accessed at the time it shutdown so maybe there was a power management issue with dealing with the peripheral devices.
I have experienced inconsistent performance with peripheral ports in Apple products for at least the last 5 years. I have encountered problems with only one firewire port functioning properly on many different machines - i.e there are two ports both work individually, try getting them to work together and one device disappears.
Inconsistent speeds with USB ports acting something like a USB-1 speed or even slower, and non-powered (or... not powered enough) USB ports on the higher end laptops - i.e; PowerBook G4 15inch could not mount an external USB hardrive on any port (without the powerlead) while the lesser iBook 14inch could on either USB port.
I don't know if these issues were specifically designed to be there (I couldn't imagine why) but they do exist and frustrate me daily.
I'd try disconnecting everything including your keyboard and mouse, if you have a spare try those and see what happens.
Once your machine is up and running (if you get that far) try plugging one peripheral in at a time and leave it like that for an hour - see what happens.
If that doesn't work start unplugging your household devices that you seem to have many of. See if this helps - i think it would be better to replace a $60 phone then a $2,000 computer or an old microwave for a newer safer one.
It might be worth going over to you neighbours house to see if the problem persists there, you might have some kind of problem on your electricity connection.
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IMac 20" shutting down randomly

Hey folks,
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Hi, a couple of questions -> Applecare? Have you contacted Apple Customer Relations?
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If the Genius can't help - Ask for the Manager...
Apple Corporate-408-996-1010.....L

All design programs running extremely slow and takes forever to save and sometimes shuts down randomly?

Ok so I'm a design student at a community college (about to graduate soon and will be continuing on getting my BFA) I have all of the creative cloud suite. I have Illustrator, Photoshop, Lightroom, InDesign, etc. Recently I started having problems with all of the programs. Whenever I work in the programs they would run extremely slow. Recently, I tried to save a .eps file that was only about 1.2 GB and it took me an hour to save, and this was when I was working off of my computer desktop. When I place the .eps file in Indesign, everything would go blank and it would freeze up. Also I had an error sign popping up from InDesign saying "out of memory". Im not sure if that is related to my computer's hard drive or indesign itself. I just started using creative suite so the creative suite is pretty new to me. Sometimes in Indesign when I do the Command+w to preview the whole project, it would be completely black and showing nothing and I would hit escape and the whole software screws up. Then I would do a force quit on the software and then Indesign would say there was a serious error and must shut down. That error message has been popping up several times now. I also talked to Apple support and they suggested me doing a Repair disk utility (which I am currently doing right now) and also recommended me contacting Adobe since they know their software. I checked software to see if there is any updates that is needed but everything is up to date. I'm not quite sure why its acting like this so I'm reaching out both to Apple and Adobe to see if both can help me solve the problem. If anybody had experienced this problem before and could help me troubleshoot this issue that would be great.

I installed the creative suite about a year ago, and this just started happening last weekend. I didn't think it would be a problem and that it would last for a day since I was working on InDesign all day and Illustrator and it usually goes away after I finish using the programs. But this has been occurring for about a week now and has not gone away. and yes the other programs are running slow. I was trying to resize some images for a client and Photoshop was acting extremely slow when I was trying to resize the image and also place an image into a 8x10 document in Photoshop. I'm not sure how to find my system specifications.
All design programs running extremely slow and takes forever to save and sometimes shuts down randomly?

Imac turning on itself and shutting down randomly

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