Mac Pro clicks off on start up

Hi, I'm not the first to experience this but I can't find anything specific to my problem and I'm trying to understand what the LEDs behind the RAM cage mean.
Mac Pro (2008) is getting past the chime but then cutting out. As it does so a yellow/orange led flashes underneath the diagnostic LEDs and then no. 5 and 6 (OT B and OT A) both flash red at the same time once a few seconds later.
What I know.
I'm getting trickle power. LED 2 goes yellow when pressing the diag_led button.
7, 8 and 9 go green on initial start up when pressing the diag_led button
I've removed RAM back down to standard.
I've reset the SMC several times.
It will generally start up once every 10-20 goes and then behave well for the rest of the day so not sure it's the PSU but then I have to go through all this again every morning to get it going again.
Anyone know what the sequence of LEDs might point to?
Thanks,
Chris

What about NVRAM reset?
Diagnostic-LED for Mac Pro(early 2008):
http://www.scribd.com/doc/51667130/52/Diagnostic-LEDs

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http://img705.imageshack.us/img705/6112/picture3o.png
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Mac Pro clicks off on start up

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