Hi vanman
Please get yourself a bigger power supply as i suspect that with your current setup something else will go.Must say this is the first time i have heard that someone runs two power supplies to power there comp and to me this spells trouble (harmonics) You have the screencard pluged in the agp slot and if you are running the 6800 ultra as i am you have to have 12v pluged in from a spare conector(the same type that plugs into a h/d)
What i dont know is how many AMPS the camera pulls when pluged into the USB port compared with the flashdrive.
When i installed my screen card it pulled my comp dead. I then unpluged one of the hard drives everything worked fine until i tried to burn a DVD and lo and behold one dead DVD drive.Bought a 500 watt power supply and new DVD drive now every thing works
Regards
Mike