IMac will not turn on at all

So I have an 17 inch refurbished iMac that I bought in September of 2007. I've had no problems with it up until this March when it was randomly shutting off.
It would shut off and would not go back on. No screen/light, nothing but a clicking noise when I pressed the button. I took the computer in and it went on in the Apple Store, and I took it home. A week later it did the same thing. I took it back in and they told me the power supply was no good. I paid for the repairs because I didn't have applecare and it was back to normal.
Now a few months later it's turned itself off and stayed off. I left it unplugged, I tried various outlets - nothing. Now when I press the power button I hear a high pitched noise from the back when I put my ear to it, and occasionally that familiar clicking noise that I heard in March.
I really don't know what to do. I'm worried it's the power supply again but really, should a power supply go that fast?
Thanks in advance. Any help is appreciated.

The same thing just happened to me today. First my imac shut down itself and wouldn't turn back on, and then the back of the computer started to make loud noise (sounded like the fan but I'm not sure) when I tried to press the power button. I bought this mac about 2 years ago and it was brand new. Didn't get any apple protection plan cuz didn't think it would really break D: I've never had any computer broken on me.
Honestly I am not going to bring it into apple store and waste my money on repairs, instead I will buy a PC tomorrow. I just had my iphone broken not long ago, very disappointed in the quality of apple products. D:

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