Dual-Core G5 won't boot. Flashing Red Light.

Hey Guys, I've got a 2Ghz Dual-Core G5. It's stock other than 2gigs of ram and a SATA Seagate Barracuda in the second drive bay.
Every now and then (on a fairly regular basis) I'll try to boot up the computer, I do hear the fans going but the drives don't spin up as usual, there is no chime and I get a red light behind the front panel of the G5 flashing. It flashes 7 times. After the 7 flashes it just sits there and after about a minute the fans go into airplane taking off mode.
I've been on the phone with AppleCare twice. A PMU reset did (possibly coincidentally) bring the computer back once or twice but has proven ineffective since. Typically I can either try booting the computer 30 times and it eventually works or I'll just leave it alone for a couple hours and it will boot up when I try again.
Resetting the PRAM doesn't work nor does holding option on boot up. This says (at least) to me that the computer doesn't get far enough to even look at the OS, the fault seems to be a hardware issue. The keyboard and mouse never get buss power.
Anyway, as I said it'll usually work eventually but I haven't been able to get the G5 to boot at all for the past 5 hours. Anyone had any similar experience? At this point I'm thinking bad logic board? Any opinions?
Thanks!
2Ghz Dual-Core G5 Mac OS X (10.4.8)

Hi, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
Presumably it is one of the red LEDs shown here that is flashing
http://docs.info.apple.com/article.html?artnum=302527
The symptoms possibly don't qualify for this - but maybe with some persuasion...
http://www.apple.com/support/powermac/powersupply/repairextension/
You could try the Apple Hardware Test
http://www.thexlab.com/faqs/aht.html
or TechTool
https://support.apple.com/techtooldeluxe/main?id=dl
Presumably AppleCare suggested you take it in to the shop...?

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