Like above, I'm going with battery. The white goo, if it's on the terminals is probably dielectric grease. Commonly used. Check to make sure your terminals are tight. If they are...
I would suggest a new battery.
You could jump it, run it, and see if it holds a charge, but in my experience, once a motorcycle battery dies, it is better to get a new one.
2007 Versys Black, V35 Bags, H&B Bars, Skidmarx Hugger.Fender Ex., Avon Distanzia, Braided Lines, Hella 65W bulbs Arrow Can, DNA Air filter, GIVI tall screen (for winter), PCIII, Baldwin Saddle. **SOLD**
2011 KTM SM-T. Crash bars, E55 Top Box, Fender extender front and rear.