Late 2007 iMac powering off randomly

Ok, so I made a thread a year ago about this problem. Basically, my iMac about eight months after purchasing it (on the 13/10/07), started randomly shutting down and restarting. After a few months, it then couldn't be powered up at all. I sent it away to be fixed under warranty (2/10/08), the repair diagnosis claiming it was a faulty PSU. After about another 4 months of operating the computer with no problems, the exact same problem has arisen again. I've tried all suggestions on the iMac support site and they only work very temporarily.
I had heard that Nvidia had made faulty chips for computers around this time. Could this potentially be the problem? I don't want to spend $320 on a new power supply to find that the exact same problem will occur a few months after repair.
My model number is: MA877X/A

What I'm referring to is the power coming into the house from your local power company. Sometimes this power fluctuates and has small spike that may not be seen on other devices such as blinking 12:00on your alarm clock. This is why a lot of people us a UPS (Uninterpretable Power Supply) to safe guard not only from storms but from power spikes from the locally supplied power.
It is not rare for this to cause power supply problems in Mac or PC's. Is it your problem maybe not, but as you said... two power supplies one right after another... well it's something to think about.
And yes it could be the power cord:
http://support.apple.com/kb/TA27217
May not be frying the Power supply but may be the cause of current problems.

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Late 2007 iMac powering off randomly

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