Mini shuts down just after start up

Any advice would be appreciated.
My mini seems to start up OK (chime, light, no flashing) but after a few seconds, it shuts down. The monitor never has a chance to come on. After repeatingly trying to turn it on, it eventually does come on with no visible problems.
I have unplugged and repluggd cables, removed connections to my USB network, reset the PRAM, checked drive capacity, checked keyboard for stuck keys, ran a virus checks, etc. I have no software that automatically comes on at start up rather than Norton Antivirus.
I am using a USB hub and it powers up when the computer does and shuts down at the same time. It, however, is self powered and the Mac Mini acts the same way even when disconnected from the hub.
OS: 10.4.8
Machine Name: Mac mini
Machine Model: PowerMac10,2
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.5 GHz
L2 Cache (per CPU): 512 KB
Memory: 1 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.4f1
My set up has been working well for a year. Any ideas?

Welcome to the Apple discussions.
Your power management unit (PMU) settings may have become corrupted. See this Apple note to do a reset: http://docs.info.apple.com/article.html?artnum=300574 . When you say you reset the PRAM, is this the procedure you followed?
Have you tried a safe boot? First unhook everything but a monitor, keyboard, and mouse. Boot while holding down the shift key. This triggers some background maintenance that may help get you going.
If that doesn't fix it, I might try to run the Apple hardware test, if your machine has power long enough to swallow a CD. Insert the first OS X CD that came with your system and reboot holding the option key down. Choose Apple hardware test, and when prompted, the extended test. If you're able to run it, does it tell you anything?

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But for me it sounds like an motherboard issue possibly its power supply electronic issue which is a part of the motherboard.
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