Operation

i have had this night vision monocular for not too long now, but, i have had alot of problems with it. i used it a couple times and then it just stopped working. i diddnt drop it or anything, i took it out one night to use it and when i went to turn it on it just wouldnt even turn on. the infared still works because i can see it turn on but when i look through the lens, the green night vision screen doesnt work. im looking for anyone to answer this question PLEASE !!!!!!!!!!!!!!!!!!!!!!!