IPhone not starting back up?

My iPhone was acting weird due to lack of space, and I made the mistake restarting it and now it won't start back up. Tried the sleep/home combination and even with the volume up trick too and nothing is working, please help! I've tried plugging it in to my computer/the wall and nothing is getting it going. I fear it doesn't have enough space to start up but I really need my personal stuff off of it

Try the plugging your iphone into your computer via a USB cord. Once it's plugged in, hold down both the home and sleep buttons. Once the apple logo appears, keep holding both buttons. Your iPhone SHOULD have the iTunes logo pop up and it will allow you to restore it.

Remember, it's in the apple contract (if you haven't done anything to contradict the warranty) that if you phone has an internal failure, they can fix it at the apple store. Only do this if you can't find a solution though, because sometimes they have to restart your phone to factory settings.

Back it up in PC with iTunes and then Hard Reset your device, after that do install Leo Privacy Guard so that you can secure your device totally.