Ok, so I just turn on my car no differently than any other day..

And all of my speakers are blown, and the sub doesn't work. I don't even want to think about it, so I'm just dropping it off at the shop that warranties all of my stuff. What the heck could cause that all of a sudden?

 

are all of the speakers powered by the same amp? sounds like a serious power surge

 

yeah sounds like you had a power surge or something, thank god you have warranties!!!! you should double and triple check all your grounds and make sure they are proper, if you dont think you know what to do take that **** in before you really do some damage.

 

i blew my speakers one time and i thought that it was a power surge but found out that my fan was blocked and heat caused the welds or sauter to melt and the amp itself surged on stock power after the fuses. did your fuses blow all the way to the amps?

 

I highly doubt you blew all your speakers all at the same time. Check the resistance of the voice coils with a volt meter by taking them out and measuring them.
I would lean more towards a distorted amp or preamp (head unit)

 

If everything is powered off a single amp, you more than likely just blew a fuse. What does your system consist of?