Urgent problem. G5 red lights on. Won't complete startup. Please Help!!

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MacForum readers,
I'd be so appreciative for your help. This is the worst situation I have ever encountered on a Mac. :(

My G5 tower (purchased in around 2006) which has served me fairly well started to go on the fritz about a month ago. It would spontaneously go to sleep, --- often, and with not that many things running. A friend suggested I do this:
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"Power down the G5 and unplug it for about 5 minutes. Then plug it back in and see if the problem reoccurs.

If it does, you may need to reset the SMU by pressing a small button inside the case. This web page has instructions on how to do this: How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005)

Look for the "Late 2005" directions. Again allow some time to see if the problem persists."
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That fixed the problem temporarily. For a couple of weeks, my computer seemed back to normal.

THEN tonight I was rendering a Final Cut Pro File and the following happened:

the screen went dark, the red lights on the G5 tower went on and the fan started to spin.
I shut it down.

I unplugged it. I reset the SMU button again.

I restarted the computer. It didn't get past the startup screen (which has never before happened, to my knowledge) and the red lights went on again.

What would you suggest I do? I'd very much be grateful for your advice. I've been waiting for the new MacPro to come out -- so I could replace this now totally unreliable computer. According to MacRumors, it has been 372 (Avg = 236) days since it was last updated, long overdue.
Mac Buyer's Guide: Know When to Buy Your Mac, iPod or iPhone

Should I take it in to the Apple Store tomorrow? I'm worried the jostling of taking it to the store would damage it further?

THANK YOU so much all in advance.
 
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Your Mac's Specs
27 iMac+Thunderbolt, iMac 21,
Welcome to the Forum. Power on and insert the Install Disk that came with the computer and hold the D key - select language and then Extended Hardware check. That may shed more light on where things are at. If that is all Ok do a reset of the PRAM here and let it boot after the third chime sequence.
 

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