I posted a new thread because it seems that my problem is a bit different from others.
It seems that my external hard drive can only be detected when plugged in directly to the motherboard or the rear of the PC)., but not in USB extension ports, or the ones you find in front of the PC housing.
It works well enough, but it seems odd that I always have to plug it in the rear of the PC housing. This is not possible in most decent computer rental shops here. You either have to plug it on the front of the PC housing USB ports, or on the extension USB ports.
It is also not detected in the drive manager *ONLY* when I plug it on the extensions or housing ports.
My external hard drive is not detected in USB ports other than the one attached to the motherboard.