Dual G4 Power Mac is Dead??? Need HELP!

Dual 1.25 G4 will turn on, fans amps up loud, screen stays black and no startup tone. I was on vacation and left it on by accident for 4 days with the monitor on. My brother turned it off for me using the monitor power button when he saw it.
I am having issues very similar to this post: http://discussions.apple.com/thread.jspa?threadID=469582&tstart=0
I have tried a deep reset, reset the PRam, battery voltage is 3.6 volts, reseated the Ram, processor, and video card, unplugged anything extra and just left it as stock. (by the way the processor heat sink is cold when it usually gets quite warm)
But still no progress or response from the two displays (20" and 17" studios)
I was thinking that I killed the video card by leaving it on for that long, but wouldn't I get a startup tone if the computer was still working?
I don't want to spend $400 to replace the processor or logic board. I might as well spend that towards a new computer if this can't be fixed more easily.
Thanks for your help.
-Jake

AirTahoe,
As you see from my post it turned out to be the processor, however plenty of users have been able to solve the similiar problem with different techniques. Most of those issues are posted in my thread. Do you have access to another mac that you can swap parts with to test your processor, or perhaps an authorized repair location? Unfortunately I did not and ended up ebaying some parts (I recently seen a dual 1.25 on ebay that went for about $200) and ended up solving my issue. Let us know what happened.
Did you try removing the battery, reset pmu, wait, start with no battery?
Michael

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I am wondering if my battery is dead.
I had stored my G4 Dual 1.25 GHz MDD for about 5 months while I moved to a new location and built my new recording studio. Upon powering it up it ran fine the first day (only had it powered up for about 10 minutes). The second time (a few days later), it was fine for 10 minutes, then the displays went off on their own (they weren't set to sleep). They would come off and on intermittently. When they were on, sometimes I had use of the mouse and keyboard and sometimes I wouldn't. After a few minutes of this they would stay off. Once they were off, the power button did not respond like it usually does. If I held it down or 5 seconds trying to power off, it would not respond. It didn't matter how long I held it, it would never power off. The only way I could power off was to pull the plug. After doing that, I restarted and reset the PRAM. It powered up and I had to reset the date and time. It seemed like it was ok for a minute, then the monitors went dark again, went on and off 3 or 4 times, then stayed off. The power button again did not respond normally.
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In the new studio, I did set up the G4 on it's side.
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Thanks or your help, Tom.
I tried reseting the PRAM, and I also reset the PMU button.
I think there is something wrong with the logic board.
I will re-post with a new title.
The heat sync is extremely hot, and the larger fan that is directed at the heat sync is not working.
I just found this article when I did a search for power mac G4 fan: http://docs.info.apple.com/article.html?artnum=95038
in that article, it mentions 2 LED's that should be either both on or both off, and there is only one of these LED's that is light
<1. Power Macintosh G4 (PCI Graphics): Check LEDs DS7 and DS8 on the logic board. In a working unit, these LEDs should be in sync with each other: both on or both off. If one LED is on and the other is off, there is a problem.>
any idea what this means ?
thanks
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www.SteveJankowski.com
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Dual G4 Power Mac is Dead??? Need HELP!

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