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First, try to reset the system. This could not be possible, but if you are able to, start with this. To Reset the system you will enter System Settings and then Backup & Reset and you can press on Reset and the system will be resetting to the initial state. If you are unable to perform this 'soft reset'. you may want to try a hard reset. WARNING: performing a hard reset wipes all data and sets the tablet back to default system setting. To perform a hard reset, push the up & down volume buttons and power button at the same time. When the reset screen comes up, use the volume buttons to choose 'wipe cache'. Then select 'yes', then 'wipe data factory' and 'yes'. After this has all finished, reboot the device. If the problem still occurs, contact Lenovo support at https://forums.lenovo.com.

This is a rarer issue. If you can see the picture clearly on the screen prior to taking the picture, then it is something wrong with the system storage. Try resetting the system. To Reset the system you will enter System Settings and then Backup & Reset and you can press on Reset and the system will be resetting to the initial state. If this does not solve the issue, you may have to replace your system board. This is a LAST CALL REPAIR. Try all other solutions prior to doing this. Follow the System Board replacement guide. If you can not see anything on your screen when in camera mode, there is a problem with the camera. Try replacing the camera. Follow Camera replacement guide.

This is a fairly common problem, and has two solutions to it. First, try resetting the tablet. Occasionally the button becomes unresponsive, and you just have to reset the system and it works again. To Reset the system, you will enter System Settings and then Backup & Reset and you can press on Reset and the system will be resetting to the initial state. If this does not work, you will have to replace the Digital Board inside your tablet. Follow the Lenovo IdeaTab A2109 Digital Board Replacement Guide.