I have a my passport wireless which was working fine a few months back but after a power cut it dropped off my wifi network. I plugged it into an old laptop and it can access the files on it and can add and remove them but when I plug it directly into my computer that runs 8.1 I can't find it anywhere (including device manager, disk management). When I plug it in the light comes on (white) and it sounds normal, just no access to it from computer. What am I missing? Am I stuck only ever using it on my old laptop?