My PC does not see MY PASSPORT 0740

FWIW: I just had an installation where the computer wasn’t able to detect the Passport at all.  (Admittedly not exactly your case, where the computer had previously recognized your external drive.)  The culprit turned out to be the USB extension cable we were using, and the problem went away when we plugged the Passport directly into the computer.  If you’re using an extension or hub, might be worth a try before concluding that the drive is corrupt.