Samsung Tab S (SM-T705) not getting booted after system update

My Samsug Tab S ws working smoothly with the andriod ver. 5.0.2. Today I updated the system as the update was avalable, it asked for a reboot after dowenload. Now the system gets stuck at the Samsung logo. I am unable to switch off the Tab using the power button. The battery got discharged fully. I put the Tab for charging & Switch on the Tab but it is getting stuck at the same point. Please advice.

The Tab was purchased at Doha, Qatar in May 2015 and is still under 24 Months Warranty.

Regards
Rajan Kulkarni
Please PM me.