samsung np700z5c won't boot

[make_me_bad27]

So I installed windows via USB once and since then my laptop required the USB stick that I used plugged in in order to boot.
Today the USB stick broke and now my laptop won't boot.
Seems like a boot loop, boots up and goes to a black screen just to boot itself again and then asks me to chose a bootable device from which I can chose my HDD or my USB stick and even after pressing both of those options it just closes and opens the dialog box again.
See this for reference.

 

[SchizTech]

There's something odd about the way you describe it booting; installed properly the OS shouldn't require a flash drive to boot from. Did anything physically happen to the flash drive?

My suggestion would be to re-install windows properly. If there are any important files I can suggest a way to retrieve them.