try to re assemble the power switch. and check the silver button if its pushing the on off or you can fell if the on off is clicking.. note every time you close or put back the touch screen make sure you check first if it is working.
if you dont have any knowledge for opening phones better to bring it in repair shop and let the technician clean your phone.. if you can remove the battery please remove it and dont try to power up the phone until it clean.
i think you can do it with your self. just try to read this steps. hope it will help you. Pre-requisites: a) Download and install Motorola Moto E Drivers b) Download and extract the stock firmware Android file host - 5.1https://www.androidfilehost.com/?fid=240... c) Get ADB (if you don't already have this, I suggest downloading and installing Minimal ADB and Fastboot by shimp208: Direct Downloadhttp://forum.xda-developers.com/showthread.php?p=42407269... Disclaimer: Follow these instructions at your own risk. These are the original stock signed image files from Motorola it should work on Moto E Asian ( Indian) Variant. Steps to restore stock firmware: 1) Reboot the phone into bootloader mode. There are 2 ways to do this. I) The 'hardware' way. a) Unplug the USB cable and power off the phone. b) Press and hold 'Volume down' then power on the phone. c) Connect USB cable to your computer.