G5 won't start, fan going full-on

Hi All -
I came into the office yesterday to discover that my G5's fan was going full-on, with a blank screen. I couldn't get it to wake up, so I shut it off, then restarted it. The machine powers up fairly silently (no start up tone), but I get nothing on the screen. The fan comes on eventually, and gets louder and louder.
I tried doing a PRAM reset, but nothing happens.
Any ideas?
I haven't tried the power supply check yet, but will unless someone has a better idea.
Thanks!
dvmgsr

I am having an identical problem with my 2.5DP G5. Since upgrading to 10.5.3 the mac wouldn't boot. Just black screen as above. I reset by taking out power plug for some time and then replacing and managed to boot into my external cloned (Superduper) drive (thank god I have one). The mac still would not boot from my internal start up drive. I erase zeroed that drive and copied back to it from my cloned drive. The mac still would not boot from it. So I guessed that I basically had a drive failure and bought a new internal 500Gb drive. I have re-copied the system and all my data onto that drive via the Superduper program so system is blessed.
Tried to boot holding the alt key down - saw the drives and my new drive was highlighted but screen froze at that state - so had to shut down using the power button.
Now the mac will not start at all.
I hear one chime (trying to reset PRAM will not work - only one chime) and that's it - nothing - just a blank black screen. Fans spinning like mad, but no start up noises - no drive activity.
Taking out the power lead trick has also ceased to work.
I am desperate! Anyone got any ideas?
Thanks

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    Hi I have a similar problem, the fan goes full speed from time to time when idle or when using youtube, facebook, etc. And the FAN will never slowdown again until i turn off the laptop or put it to sleep. What I have noticed is that the integrated video card runs hotter that the 770m discrete card not sure if that's the one triggering the fan at full speed.
    I found a post about a fan controller for a msi gt70 2od laptop and it works, it truly modifies the fan speed, but not sure how good that is, because if the fan is being activated because of the card getting hotter and the fan is set to 10 or 20% it may not be enough to cool it down and keep the temperature at safe levels at least while leaving the laptop on all night long unattended.
     hxxp://forum.notebookreview.com/msi/718530-official-msi-gt70-2od-owners-lounge.html (Dave Pearson's GT70 2OD FAN CONTROL v1.2, and photos of this can be seen)
    BTW the fan started to work at full speed after I installed windows 7 ultimate 64 bits and continue to work this way even when I went back to Windows Home Premium 64 bits. Also a 8GB ram module was added to this laptop.
    If you were able to solve this issue please post the solution here, so everybody is aware on how to solve this issue.

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