Why won't my iphone 4 screen turn on?

My iPhone 4 screen just refuses to turn on. It went dead, so. Tried to charge it (it has been three hours now since I started charging it). When I charge it, an apple logo comes on, but nothing else. When I take it out of the charger, it goes black. I have pressed down the home button, the sleep button and even held both down at the same time, but nothing. Very very frustrating, can someone please help?

How to see how much space jailbroken apps take up on my iPhone?

I have a 16GB iPhone 4s and I had like 15MB free, I've deleted some things so now I have 400MB. My photos and general apps take up maybe 3-4GB and I have no clue where the rest of the space goes. Is there an app to view how much space apps from Cydia take up? As I gather it must be one of them.

Where can I find my movies on Iphone 4s?

So I just got an Iphone 4s with a IOS 7 update. I tried putting some movies on it and according to Itunes, it's on my phone. But when I checked, I can't seem to find it anywhere. Even on the Photos app. I read some on the internet the videos app is on the Ipod app and I didn't really get. (Apple noob here.) Please do help! The movies are eating up my phone's space! Please and thank you.

My iMessage is out of date on my iphone?

I recently restored my iPhone to a backup from about a week ago, as it wasn't connecting to my computer. Now my imessage is only displaying the messages from about a week ago (at the time of the last backup), so is there any way to get it to display all the messages up to now?