Wiped data, cache and everything on Sony Xperia Neo V MT11i, now it's stuck at Sony Logo!
First thing is to make sure your phone is charged fully, or at least above 80%. 

Also make sure you're connection to the PC is undamaged, USB ports in good condition, USB cable too. 

Make sure you have the correct drivers for your device and the all the correct information about the device to prevent installing another incorrect rom.

If you get the adb to work using those tips, clear the cache and data etc. On the phone to remove any chance of the correct rom being corrupt by the one you tried to install before. (Don't forget gApps!!)