Out of curiosity, did you try re-flashing the firmawre. Normally a white screen means either the firmware is messed up, or that the memory module just needs to be re-seated.

Is it still under warranty? Maybe a call to tech support, not mentioning the iPod thing, would get you a replacement. :)

Tired of waiting for your device to do what you need it to?

Ya.. Ipod interface will kill most things.. Sansa players.. your brain lol (sorry, little bit of bias there :) )
You are correct however, the main board is shot. You may want to check Ebay, as they have many scrap parts players available