I'm building a solution that uses an Arm-based embedded Linux PC (a Technologic TS-7553) with an Arduino (currently using a Duemilanove).
The Arduino is powered by the USB port. If the Arduino is plugged into the USB when power is applied to the PC, the PC will not boot.
While searching the forums, I found information regarding when the Arduino was powered separately, but I haven't found any people having problems booting with the Arduino powered by USB. I tried a powered USB hub, which didn't seem to make any difference.
I'm thinking this sounds like it may be a problem with the PC, and I also have a query into the manufacturer. But I'm wondering if anyone here may have some guidance. I'm much more a programmer than an electronics expert, so any guidance is appreciated!