Yah my G5 iMac is booting to screaming fans

My beloved G5 iMac is booting to a gray screen and screaming fans.
How the heck do I get around this one. I did a search and have found posts about the fans going crazy but it sounds like this is happening to people when they're booted up to the desktop. Not so for me.
BTW no bulging capacitors, everything looks good. I've kept this very clean.
So any thoughts on getting my computer back so I can get back to work much appreciated.

I am having the same issue. Mine will boot using the install disk. I ran disk repair and permission repair from the install disk but it still will only boot to a gray screen with the Apple logo and racing fans. Cannot get the install disk out of the iMac.
Any suggestions would be appreciated.

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    [Topic : kmosx: Kernel Panics? Don't panic too !|http://discussions.apple.com/thread.jspa?threadID=121923]
    [X-Lab: Resolving Kernel Panics|http://www.thexlab.com/faqs/kernelpanics.html]
    [Tutorial: Avoiding and eliminating Kernel panics|http://www.macfixit.com/article.php?story=20060911080447777]
    [Tutorial: An introduction to reading Mac OS X crash reports|http://www.macfixit.com/article.php?story=20060309075929717]
    [12-Step Program to Isolate Freezes and/or Kernel Panics|http://macosg.com/group/viewtopic.php?t=800]
    [Texas Mac Man's post on kernel panics|http://discussions.apple.com/thread.jspa?threadID=1723768&tstart=0]
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