Mobile hard drive suddenly does not recognize the

Seagate hard drive, plus hard to do mobile hard disk box, before using the normal Zaicha There was no one to die on the computer.Tray icon has prompted USB device.Disk Manager can not see inside the disk, my computer Also did not show that letter.Replaced the computer tried case, power supply, data lines are replaced, but none of the line.
I mmc order to add snap-in, add the management of the disk or hard drive can not see.
I hope I can help to solve an expert, (the use of much-needed hard drive's data)! !
grateful! !

is not a good play! Box-for-1.Did not play well
2.Hard

broken down even in the case of direct IDE I try on a buddy-for-all, it is that hard disk problems, and had to format to see .Change the hard disk jumper to try ..