Dual G5 won't power on - power led lights on push only

Hi,
My 2Ghz Dual G5 doesn't turn on and I hoped someone could provide advice on repair.
When I push the power button the power led lights (once) but nothing else happens.
I have reset the pmu, replaced the internal battery and swapped RAM with known good.
I don't think my model has internal LEDs on the MB.
Would the power led still light if I have a bad power supply?
Is there any way I can tell if i have a bad motherboard rather than a bad power supply?
Thanks,
Tom

In the G5 manual, in the section on trouble-shooting, it says what one light blinking, two blinking, 3-blinking means.
I'd look it up for you right now but I'm at the libary, using their public computer, since my PowerPC G5 also died, at last, 4sure, last week. I had that light blinking three (3) times.
I've come to conclude it is a bad logic board that many other threads mention. Cost for repairs are very high.
I (seriously), without realizing it, went through some noted classic symptoms of "grief." -- First, there was Denial (i.e. Disbelief); then Anger; Then I tried last gasp measure to make a miracle happen, trying to "be reasonable and negotiate," a fix.
All repair people I contacted told me to buy something new. I "lnegotiated," some extended credit and creative bridge financing. (Um...can you spell: p-a-w-n shop....deliberately going into overdraft protection...whatever I had to do, etc.)
Today, I placed the order for a Mac mini, M239LL/A. ON EVERY SPECIFICATION it is better than my now dead PowerPC duel 2.3 G5 tower and cost one-third the price. Plus it has Bluetooth and Wi-fi.
The Black Friday Sales are soon approaching so this may be the best time to make the transition. It would have cost as much to ship and repair my G5 tower and not only do you get the latest version of iLife, Snow Leopard, but rebate deals that you can get when buying a new computer offered iWorks at half-price, discounts on other Apple software, and third-party software. I got a full $80.00 rebate on an HP F4480 all-in-one printer (that only cost $80.00...plus you get that free subscription to a Mac magazine and back on the cutting edge of computers instead of looking at other's ride the surf.
Ten days ago I was devestated. Today I am as excited and pleased as I was five years ago when I got the G5 tower.
EVERYBODY I talked to, at the library computer lab, friends, all nodded their heads sagely and said: "Yea, five years...that's about it for a computer."
It just took me ten days to 'go through the transition. It was strange that something so valuable suddenly was worth nothing; i.e. not even worth repairing.
I had 4.5GB of RAM. Never needed more. Now I'll have 4GBs of 150% faster ram, 14% faster CPU, the new apple age mainstream Intel chip, etc.
I was using two PCI-X slots...that's about the only thing I won't be restoring but their use was not necessary at all and PCI-X slots were almost out of date the day i got them and what I really wanted, a video graphic's card, didn't exist for PCI-X.
So...that was my experience with this unfortunately event -- the death of a good machine.
But I was very pleased to have 4.7 years of trouble free prime time computing and didn't really think about leapfrogging to the future and doing it again.
If my old G5 was still going I'd still be a-okay with it, but stuff was happening with software improvements that were for Intel only and that just, slowly at first, got more significant.
The death of my G5 was like a "wake up call!'

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2 GND Black ------------- 14 Power ON Green
3 FANtach White/Yellow -- 15 GND Black
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7 +12Vaud (12V2) Yellow - 19 GND Black
8 GND Black ------------- 20 +5V sense Red
9 +3.3V sense Orange ---- 21 GND Black
10 GND Black ------------ 22 -12V Blue
11 GND Black ------------ 23 GND Black
12 Reserved ------------- 24 Reserved
Power Supply P2 Connector
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1 +3.3V Orange ----------- 9 +5V Red
2 +3.3V Orange ---------- 10 +5V Red
3 +3.3V Orange ---------- 11 +5V Red
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3 GND Black -------------- 7 GND Black
4 12V2 Yellow ------------ 8 +12V2 Yellow
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