I just got a 2TB T7 - same problem. It's replacing a 1TB T5 which has worked flawlessly. I hooked up the T7 using the same cable as the T5 (USB C) and...nothing. Blue light came on, Windows 11 did not acknowledge that a drive was connected.
After much frustration and fiddling, I got it to work. The solution is ridiculous but worked for me. Maybe it will work for you. As it turns out, I think there's a defect with the T7. USB C is supposed to be agnostic of which rotation/orientation the cable is inserted (whereas USB A will insert into the port only 1 way, for example). In my case, I had to rotate the connection to my computer a certain way, and the one to my drive a certain way. There are 4 combinations. Of the 4, only ONE worked.
I plugged one end (let's call it X) into the PC, and the other end (named Y) into the drive. Nothing. So I took end X and rotated it, plugged it back in. I repeated this process with plug X, then plug Y until finally the PC recognized the drive. It doesn't make any sense to me. And this was NOT the case with the T5. I kept the cable in the same orientation that I originally had the T5 in - which was working fine. Furthermore, this behavior happens with the USB C cable that is shipped with the T7. So it's not a cable issue.
The only thing I can think of is there's a defect in the T7 such that the USB C port doesn't actually support both orientations of USB C. For what it's worth, it worked just fine with the USB A cable.
I can't really explain it, but try flipping your cable through all port orientations to see if it works for you.
