Sorry I’m asking this without specs at hand; I’m away from my desktop at the moment.

I built a PC a few months back, and went through this long, irritating ordeal of installing Win 11 IoT Enterprise LTSC (a driver wasn’t working for the video card; eventually the driver got updated, and now it’s great; otherwise, MASGrave is fantastic). I have a 2Tb PCI-e drive. But. Any time I try to install an old 3.5" 7200rpm SATA drive, it won’t even start. As in, nothing at all happens when I push the power button; it won’t even get to BiOS, so I’m pretty sure that it’s not an issue with trying to boot from a volume with no operating system.

The same hard drives work when I used them in a powered USB enclosure. They’re slow, because it’s over USB, but they work.

I think my power supply is 800W. My gut feeling is that my power supply is insufficient for the added power draw of a traditional hard drive. Does this sound correct?