If everything works including the front I/O. then there's nothing to really worry about. Just annoying at boot up having to bypass that message. Likely a loose cable inside, and for that you would need to access the inside. Since you don't know how to even get into it, my suggestion would be to contact a Dell agent using the get help now button in the lower right corner of the screen. You still have 36 days of warranty left, might as well use it.
Hello,  my Aurora R9 I bought a few years back just started having this little pre boot error I've never seen before. It's error 2000-0716 and says there's an error with my power cables. Once I hit continue I enter windows with no problem. I've seen a post a few years back but no real answer. I am wondering if I should be worried?  My warranty is about to expire (36 days) and I have no computer hardware know how of anything. Thank you
Aurora R9, pre-boot error 2000:0716