My iPhone 4 went black and won't do anything?

I just had it in my purse then my screen went black and wot turn on or do anything! It happened 3days ago and today when I tried turning ot on it had battery low thing pop up? But still nothing after it charges? Help please tried restoring and won't work! I tried pressing home and off/on button and nothing!

Did you try pressing home and off/on button at the same time for 10 seconds? Also, try removing the sim card and putting it back in (sometimes it pops out a bit and this might cause black out). Here are instructions on how to do it, incase you need to know:

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