IMac will not turn on after a few days use. Interesting Solution, sort of :P

I've posted about this before. When it is working, it's perfectly normal, when it's not, pressing the power button will only result in optical drive spinning, no chime, no boot.
Well, here's what I found out. If i leave the computer plugged in/out and try to start it every 12 hours or so, the machine will not boot. I tried this continuously for about 10 days. I got fed up trying and was about to sell it to a repair shop and I unplug it from the wall for about 24 hours and vola, it works now.
I am thinking that maybe if I unplug it after use everyday, it will be a fine computer. I am suspecting that there's some kind of "discharge" taking place when i unplug it which in turn cause it to work fine. The "charge" get built up when I plug it in (whether I use the computer or not) and that's causing the no boot problem. I am also guessing that it takes about 20+ hours to complete "discharge" to a level that is workable for the machine to boot.
Any idea?
Just wanna share my experience and maybe someone can provide me with a better solution.
Thanks.

It worked fine after that. Before I got it, the previous owner had left it in a closet for 3 months. I assumed the PRAM battery was dead and that's why it wouldn't boot. So it seems like it needed a new battery and a deep power discharge/reset.
As for your computer there's a bunch of things I would try more or less in this order: Reset SMC, reset PRAM/NVRAM, check RAM seating, run the extended hardware test (if it can boot), reinstall the OS, replace PRAM battery, try running the computer with a UPS, replace internal hard drive, replace RAM, replace power supply. As you can see it gets more expensive as you run down the list. It sound like a hardware problem but I can't even guess the cause since I've never seen that problem. If nothing comes up in the hardware test, I would begin to suspect the power supply.

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