Rear USB ports get no power after apple boot screen...

I have an iMac G5 iSight - 2.1GHz with 2GB RAM and a 500GB hard drive... this machine has been stock since the day I bought it... with all updates applied and is in a clean office environment with a UPS backup powering it... so I can rule out dust dirt and grime being an issue here...
Things were working fine on with this machine until a day ago when I turned on the machine and when I got to the login screen the mouse was not working (stayed up in the upper left corner) and no red led light on.
So i tried restarting multiple times and used all three ports on the back of the unit with no luck each time... I them disconnceted all external drives and printers from the unit - also no luck.
Next I tried resetting the PMU and the PRAM with no luck. I did this by powering down the iMac and removing all cords (including power cord) - then held down the power button for 10 seconds... powered back up and held the ALTApple+PR until the machine reset three times.
I find it odd the keyboard works right before the boot screen comes on... but as soon as the boot screen comes up... I can see the power to the mouse cut off...
I know the keyboard and mouse work fine as they work on my Mac Mini with no issues... what the heck is causing this. I canot get into my mac... with the exception of screen sharing from my other mac.. but I need to get the USB power failure problem fixed.
Any other thoughts???
Thanks for any suggestions...

What's odd also is that if I boot into Open Firmware (ALTAPPLE+OF) I am able to see the mouse powered up and the keyboard works fine - I even followed these steps to no avail:
http://support.apple.com/kb/TS1812
Apple if you are listening - please check what the 10.5.6 update is doing.. al of this happened after I updated.... nerve racking considering I work from home... it's killing me...

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