HDD hardisk not working,not visible in the laptop,visible in device manager for 1min then disconnect

[nandini]

HDD 1 tb Seagate hardisk not working,is not visible in the laptop, can b seen in device manager for 1min then gets disconnected automatically and the light on the hard disk starts blinking

 

[TheHawk]

If the system worked before with this drive, I would say the drive is bad.