Why Won't My I Mac G5 Start Up?

I'm having an intermittent problem starting my I Mac G5. I press the start up button and no go. I try and try, unplug the cable, purchased a new cable, done everything I can think of and nothing works. Then suddenly it will start. I thought it might be the cable because once when I jiggled it the computer started up. I decided that I'll take it to the shop when it won't start anymore at all because I fear that if I take it in when it's intermittent they might not find the problem.
Does anyone know what other reasons could cause this sort of start up issue?
The machine in question is several years old and it's a G5 I Mac, 1.6 GHz PowerPC G5, not the Model listed below which is a newer machine and thankfully starts up just fine.

For me, it turned out to be a bad power supply. $60+ plus $38 labor at the local Apple store. If it's the switch, good for you. My Mac was running forever. I shut it down and moved it to another room in the house. When I went to start it, it wouldn't respond to my button press. Took to to the Apple store and had a Genius look at it. He tried resetting something by holding down the power button for a long while. That didn't work. Ended up leaving it for a power supply replacement. I wasn't going to pay for more than that...

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