I bought a refurbed Dell Inspiron 15 in beautiful condition but the 1tb HDD it came with is impossibly slow. I put in an Intel SATA M.2 240gb drive in the available slot but it is not recognized anywhere. Not in the boot menu, bios, windows disk management or list disk. If I plug it in via a usb adapter then it is recognized just fine. The drive seems to follow the support requirements. I've tried disabling secure boot but it just says "checking media" and can't find anything if the HDD is not installed. I also disconnected the battery for quite some time to clear cmos. Any advice on diagnosing this would be great.