Panic, kernel trap on 2012 27' iMac

[Alska]

My late 2012 27' iMac crashes and gives this message every time I turn it on. Any ideas?

 

[Lunder89]

Have you tried running Apple hardware test?
You can open Hardware test by holding D, before the Apple logo appears on screen.

As I can read it doesn't even locate your operating system.
My best guess is, that this somehow hardware related.
But try running the hardware test and see what comes back.