my imac will not turn on? what could be the problem?

I have a 2011 iMac.  Two days ago it would not turn on...have checked the power outlet and it is working.
I suspect the problem is not in the cable to the power bar.  This machine was a lot of money and was working
well 3 days ago.  Do you think it is the power supply or could it be worse and be the motherboard?
My question is related to a major concern...I do not want to be raked over the coals by some apple service centre
to run their diagnostics and levy a very large cost in $.  What are the chances that it is the power supply?  If it
is just the power supply I am prepared to pay the $ for the power supply but if they try to take me around the bend I will dispose of this computer.  What is your advice?
thanks,
Capreol
capreolAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

JohnBusiness Consultant (Owner)Commented:
I think the power supply is the likely candidate. You need an Apple power supply. Look for an independent Apple service store and ask their cost for an estimate of repairs. Then decide whether you should replace the machine.
0
Gerwin Jansen, EE MVETopic Advisor Commented:
What happened between when it worked and when it stopped working? Did you have a power failure? Did you switch it off normally? What is the exact model you have?

A power supply is about $40-50 on Ebay but replacing it is a bit of work and you would need some tools (see: link).
0
8046586Commented:
If you are confident is your handy skills you can do a basic diagnose your self. Many videos on youtube will show you how to open iMac (and tools are not that special, you can always improvise if you don't have them). First smell it the back of the screen, near the cable plug. Usual power supply issue is burned component.
The second check is plugging the iMac into the LAN and scan the network from another device. You might get ping response.
The third check will be removing the screen and power the iMac. Check if there is any led light working on the motherboard, is the CPU fan spinning, is the HDD spinning (ignore this if you have SSD).
If all of this is not working, you can start the power supply removal. Ask someone to test the power supply with a voltmeter before you buy a new one because it will be a waste if the problem exists with the motherboard or CPU.

https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+EMC+2428+Power+Supply+Replacement/5962
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
capreolAuthor Commented:
Thanks Nick.  That is a very good answer.
Capreol
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Apple Hardware

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.