I also had this issue. I found it to be a hardware issue. When you slide the gamepad out, is hard/sticky to pull out? If so, it may be the cable that links the GPU/CPU to the screen. There are two options to repair this: Repair it yourself (Parts and a Guide can be found on google) or, if you are still under warranty, take it into your carrier and tell them what is going on. A hard reset won't help seeing as the issue is in the hardware. If you are not under warranty, sorry.
