How to resolve 'reboot system now' on SNAT71 tablet

My device shows ‘Android system recovery 3e’ i have tried the options of button pressing in the various combinations. I have also tried ‘wipe data/factory reset’ option but to no avail. The tablet refuses to stay switched off or carry out any of the options to ‘fix’ the Android system recovery 3e problem.

Any application of the buttons looks like a shut down because the screen turns black but it then tries to restart but gets stuck.