Good afternoon sir. same problem here. My Buffalo HD-PE500U2 was bought in Singapore and unfortunately after using it for several years already (3years), when attached to my PC it becomes now undetected. I also tried looking at the Disk management but still can not see it. Also the blue led light initially lights up and then after 2-3 secondsits gone. And I can't seem to Access it anymore. Please tell me what to do, Thank you in advance