Hi, i have this Asus n76vz and when i plug the external hard drive, no matter what port, the port sparks. But still once i plug it it works, except that after i unplugged it, that port stopped working with another hd, and a 64 gb pen drive. But it worked with another pen drive. Then ' rebooted and it worked again as normal, but it still sparks when plugging that hd. I think it something in the external hd, maybe the cable. What do you think?