My phone starting getting really laggy for a couple days. Each time I just shut down (using the task manager) every app that was running, and didn't think much of it. After a couple days I went for a simple restart, and it just never came back. It's stuck at the white 'Verizon' screen and I have to pull the battery to power it off.
Oh no, let's bring some life back to your Galaxy S4! Is it still stuck on the Verizon screen? Does removing the battery help? Was an application added when this started happening. Please provide additional details so we can get to the bottom of this for you!