Ipod nano 8GB 3rd generation frozen with an hourglass icon on black screen

[qanda]This question is published in the hardware section for the Apple iPod Nano (third generation, 8GB, black). Click here to view full specs.[/qanda]my ipod is frozen.It only shows an hourglass icon and a black screen then hangs up.I tried to reset it toggle the on off button press and hold the menu and center botton.But nothing happens.I tried connecting it in my computer but it cannot be recognized.I open device manager and saw the device visible in the unknown device.I updated it with new drivers but it says no driver updates found.Help me please if somebody encountered this problem.Thanks a lot.

Have you tried here and followed the steps carefully?