I just replaced my hard disk put a new one on my inspiron 5520 I couldn't no data left on old one. I wanwanted to install Windows 10 that I had before but it is not booting up from my USB drive. I don't know what to do is this have something to do with BIOS or something.
The Inspiron 5520 was never tested for Windows 10 so it could be anything from BIOS incompatibility to other hardware. I wouldn't bother with windows 10 imho.