My Iphone 3 Screen won't come on?

I've just had a second hand Iphone 3 off my Dad as he now has an Iphone 4. I've tried turning it on and although it lights a little nothing appears on the screen, though it has been making noises and a voice has said something about voice commands. I've tried holding down the button on the top right but no change and it's also been charged for a few hours now. I've not yet put a SIM into it. The phone worked fine previously. Can someone please help me to get it working!

Added (1). Thanks Jacob, tried it but still not working: s

Hold down the power button for 3 seconds then without letting go of the power button hold down the home button and hold them both down for about 12 seconds then let go of the power button and keep on holding down the home button for 15 seconds.

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