My iphone won't turn back on?

So my iphone 4 said that i was out of memory, so i deleted my twitter app and went to turn it off. Then when i went to turn it back on, it froze on the silver apple with a black background screen. It's been about 15 minutes and i tried plugging it in to a charger and the computer.nothing is working.

I really recommend you go to Apple about this. Just go to apple.com and then at the top right it will say "Chat Now" trust me I have done it a lot they are very nice, fast, and 85% of the time understand your question.

Hold down power+home keys until apple logo apears. Then let go… Work now?

if not, and itunes restoral won't work, then call Apple 1800myiphone

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