Well apparently my husband was watching movies on the tab while riding home in a bus and then the tab went kaput! It won't boot up.I suspect that the battery got drained and just refused to function.We tried to charge it but it still didn't work.We searched online and found a similar fix but to no avail, so we tried several button combinations to try to enter the recovery mode.We did that because we don't have the manual.So you can proceed at your own risk!
1.Push the Reset button with a sharp ended toothpick to turn off the tablet.
2.Remove your SD card so it won't get wiped out.
3.Hold down Menu+Power button for about 5 seconds,do it again if it goes back to the android logo.
4.If you are successful, you will see the options -select something like Recover/Wipe all data.Apparently you don't have any choice but to do it.Use the Volume buttons to scroll up and down.
5.Your Intex Envy will be reset to the factory defaults.
6.You can now install your other apps. and change settings that you like!
It actually worked better after the recovery and the tapping is more responsive than before.