My Iphone shut itself down and wont turn back on?

I broke my lock button about 2 months ago, and ive never had any problems. i used accesability touch to lock my phone, and sat in my living room. A little while later, i tried to open up my iphone by pressing the home button, and it wont turn back on. its completely black. I've tried plugging it up, ive tried plugging it up to my computer, but itunes doesnt even come up. i cant do a hard reset, because my lock button is broken. I dont want to get my lock button fixed, try to do a hard reset, and it turn out its a completly diffrent issue. Please try and help me solve this issue! I just got my iphone 4. I don't want a $250 dollar paper weight!