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Since you forgot the password, you will have to factory reset it unforunately. Turn off the device. Then press and hold down Volume Up and Power at the same time for a few seconds and what do you see ? Does it boot into any screen ?
yes as i told you it says its updating and then goes right into rebooting goes off and thats it.
Hold down Volume Down and Power at the same and does it boot any screen?
If not, hold down Volume Up, Down and Power at same time and let me know what do you see
then downloading and installing update
then flashes rebooting goes off and thats it
If you have SD card installed on it, then remove the SD card. Then connect it to your computer and attempt to boot into recovery. Let me know the results please.