See if it is holding a charge. Also, it might only charge properly with the charger it originally came with. The original Nexus 7 (2012) uses a charger that's rated at 2 amps. The second generation Nexus 7 (2013) uses a charger that's rated at 1.35 amps. If you're using a third-party charger that's rated less than the two I mentioned, it might might not do enough to charge it.
There are various types of Nexus devices, but the Nexus 7 is part of that same family.
The 2012 Nexus 7 came out on July 2012. The 2013 Nexus 7 came out on July 2013.
Check to make sure the Nexus 7 has been charged. It's a good rule of thumb to charge the device when you first unbox it prior to starting it up.
The 2012 Nexus 7 debuted on July 2012. The 2013 Nexus 7 debuted on July 2013 (August 2013 in Canada).
Yes, the Nexus 7 (2013) is Bluetooth Smart Ready certified. The 2012 Nexus 7 supports traditional Bluetooth.
The Nexus 7 is an Android Tablet made by Google. It has a screen size of 7 inches.
In the 2012 Nexus 7, it came with a single camera (in the front). The 2013 Nexus 7 has two cameras, one in the front and one in the back.
I don't understand the context of your question, so I'll give you a few scenarios. If you are reactivating a Nexus 7 from sleep, just press the power button and a lock screen will appear. Assuming it wasn't encrypted, sliding the lock icon to your right will unlock it. If for some reason your Nexus 7 froze, you can long press the power button and it will turn off. Pressing the power button again will turn it on. If you have obtained a used Nexus 7 and wanted to reactivate it, you can go into Settings > Backup & reset, and do a Factory data reset. Remember by doing this, it will erase everything stored in the device. Once this is done, you would then setup the Nexus 7 from scratch.
Nexus 7 tablet 2013 Has a front and rear Camera.
Yes, the Nexus 7 comes in LTE versions.
The Nexus 7 is the better tablet.
The 2012 Nexus 7 had a soft leather back. The 2013 Nexus 7 went for a harder shell with a soft touch-coated plate.