"No Bootable Devices" on startup- Dell Latitude e6530 win10

Hello

I recently upgraded my Latitude e6530 from win7 to win10, after a month or so I started experiencing getting a endless loop of "system recovery" startups that I struggled with- after that went unsolved for 3 days and left me laptopless, it managed to boot up properly once, then after I thought i'd try to defragment my drivers and pray I closed it for the night only to reopen it the next day to a black screen that says "No Bootable devices" then options like f1 to retry, f2 for setup utility, and f5 to open the preboot system assessment. none of these options have lead to any answers.

so now i'm using a friends laptop to ask for help- I tried looking for results by searching for win10 issues for days so I thought id try looking into the actual laptop for things like how to factory reset if it comes to that or for different "f1-f12" startup options that I don't know about. I don't know, i'm clueless at this point.

I'm sure it has to do with the windows system- like somehow my computer doesn't have any operating system on it? I don't know, If possible I'd like to resolve this without losing my files and stuff but i'm willing to lose them all if needed

any help is appreciated.