Broken power button mikona I have an android tablet (mikona) and my power button has broken quite literally snapped inwards and it has turned fully off I have opened it up and looked at the circuit and the area around the power button. How do i turn it on?
Try plugging in the device with no battery and then put the battery back in while it is running !

Also try plugging in the charger to load the battery bar and then hold all buttons aside from power,
 it might cause a forced reset and restart into the system like a normal restart !   

If none of the above works..
try adb Use ADB and run the command 

adb reboot


If you can't pick up a device with

adb devices


Then you'll need to hope they included a V-COM boot before boot.img

To access V-COM You'll need the driver for your device and a flashing program like 
SP Flash Tool

• To check for V-COM compatibility you'll need to Open Device Manager as the Administrator on your PC,
• Pull out the battery if removable "if not removable read below" and plug in the device
• LOOK CAREFULLY FOR UNKNOWN DEVICE OR  V-COM DEVICE 
• IF YOU HEAR THE COMPUTER GO BEEP AT ALL, IT'S REGISTERED A V-COM DEVICE

IF YOU DON'T HAVE A REMOVABLE BATTERY 
If you don't have a removable battery, then v-com will only connect for a few seconds and then disconnect when the screen comes on !