I got my iphone screen replaced 2 months ago & it's suddenly not working?

My touch screen is not working & I have no idea why! It doesn't have any water damage what's so ever, could it be something to do with the screen replacement?

Usually repair shops give you up to 30 days warranty with covers replaced part if it's defective. In our repair shop - http://www.fixmewireless.com we do that.
But I've seen some shops give up to 90 days warranty. If you fixed yours at one of those places you can go back and ask them to check your phone.
Repair shops will not fix it in warranty period if there's any physical damage, water damage and etc.