I wonder if anyone could help I charged my nexus up yesterday I switched it on and it keeps sticking on the 4 circles I tried to restore it with no luck now it wont switch off

this might be of use:


Make sure there isn’t any dust or lint in the power port.
Using the original power adapter and USB cable, plug your Nexus 7 into a functioning power outlet. Nexus 7 has specific power requirements, and the USB cable and power adapter that are included are designed to meet those requirements.
Ensure the power cord is securely connected to the tablet and the power adapter.
After 1 minute, check to see if a battery icon appears on the screen.
If the battery icon appears, press & hold the Power button for 15 to 30 seconds to see if the device turns on.

If the battery icon doesn't appear, try accessing the Android bootloader menu:

Press & hold the Volume down button. While holding Volume down, press & hold the Power button for at least 10 seconds until you see an Android robot and the word Start on the screen.
Press the Volume down button until Power off is highlighted. Press the Power button to select that option.
Disconnect the charger and reconnect it within 10 seconds. A battery icon should appear on your screen.

Once the battery icon appears on the screen, allow your tablet to charge for at least 1 hour before turning it back on.

basically there is a menu that comes up if you hold volume down and power during boot.

Thanks for your help I will give it a try