Can't Power Up Without Unplugging Then Replugging

I'm almost positive this is my fault...
My PowerMac G4 is plugged into an outlet which is turned on an off by a lightswitch on the wall. The lightswitch has been bumped a few times, and even though I tried taping the switch to hold in the up (on) position, the bumping has occasionally shut off the power.
A few days ago, after turning my computer off the night before (the cofrrect way, using the computers power button), I pressed the power button to turn the machine on and nothing happened. The computer did not turn on.
*I unplugged the computer and then plugged it back in. Then I pressed the power button and the computer turned on!*
This is an ongoing pattern. The computer will NEVER start up from shut down without unplugged and replugging it in.
I've tried two trouble shooting tests: I've changed outlets and I've swapped power cables. No luck. Is this a Power Supply issue?
PS: Since I've gotten the computer, I've put in a new Radeon 9600 Pro graphics card, a Sonnet Allegro USB 2.0 card, and two Kingston 512 MB RAM sticks.
Thank You.

I would check the battery first. When mine went, I had no response from my Mac at all; just a light on my power button; absolutely no boot at all.
Check out things in Texas Mac Man's Battery, PRAM, PMU tutorial on the subject. His tutorial is a little dated (don't believe it even mentions G5's, or Intel Macs) but the info in it, except SMU and SMC not being included, still applies.
DALE

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