Your shot in the dark was not far off. Turns out there is a Linux server that it's mounted to, or somehow connected to for backup of data. That machine was down suffering from a bad power cord, making it unreachable.
His machine was mounting a remote NFS share, that share was not available so the machine hung waiting for it. I understand he restarted the NFS server.
Hi ..i think there is some NFS version mismatch try changing the NFS version in /etc/default/nfs file from version 4 to 3 and try ..it should work. Dont forget to restart your services again after doing any changes.