Blackberry Problems please help asap?

well i have had my blackberry for a while now, and about one hour ago i was listening to music and i decided to prat about so i clicked on the camera and my phone froze and wouldnt let me click back on the camera, so i decided to reboot it by taking the battery out then putting it back in and now it wont turn back on, i have tryed everything from taking the battery out for 10 mins then putting it back out to taking the memory card out, i need help which will not include me phoning any phone companys and help which i can do in my own home, please help asap as it is needed in the next hour !