Samsung ht-c450 Prot Error

[Devilstreak]

I bought this cheapish Home cinema system last year. (Just out of the 12 month Warranty window)

Yesterday I went to turn it on, It displayed "PROT" on the Units screen and then turned off. I looked through the user manual/Troubleshooting and I couldn't see this mentioned in it.

I've had a quick browse online, It seems that Prot means Protection, something to do with the Power, or shorting speaker wires? Anyone come across this before? Or a fix?

Thanks in advance.