Inspiron 15 refusing to boot up properly; "No bootable devices were found!"

Hello, friends! I have no idea what I'm doing, so please bare with me.

I got my Inspiron15 a few years ago. I've probably had it since it was released, now that I think about it.

I've not used it for the past 3-4 years, as I got my Macbook Pro around 2017-2018. However, when attempting to boot it up for funsies, I remembered why I stopped using it-- it refuses to boot up. 

Basically, a screen pops up that says something along the lines of "Your system seems to be having trouble starting" and it is "scanning your hardware for a possible cause". I can only click ESC to stop the scan or F2 to see the BIOS setup which leads me to a bunch of weird system things that feels like a big pile of gibberish.

I sat for maybe 5 minutes waiting on the scan to stop, but it stops at the estimated time of 1 second. From there, it will not budge. (UPDATE AS I'M WRITING THIS: About 3-5 minutes after this, it pops up saying "Hardware scan complete with no issues... No bootable devices were found! Possible causes could be a corrupt OS image or a boot device is not enabled in BIOS setup". Once again... gibberish to me.)

As far as what I do know, the battery needs to be replaced, but I've had computers say this before and all it needed was to be on charge constantly while I used it. I do know that the battery could still be the sole problem, though.

All I want to do is to be able to factory reset it and possibly use it for college work, as sometimes my Mac cannot access certain files because... well, it's a Mac.

Thank you for reading and your potential help, I look forward to seeing any and all responses you have. I will try to look at them as soon as possible, but life can get pretty busy. Thank you, again!