My iphone 4s speakers are broken?

I got my iphone 4s recently and i'm pretty sure there was no water spill or anything. When i try to play music it doesn't work and when i click the side buttons for the volume, the box comes up but not the bar.i've been researching this and people said to clean the speakers, charging port, and headphones. I did this several times and it worked the first time and it broke again. I used a toothbrush, credit card, toothpick, and a hair dryer. I tried every method but it fixes and then breaks again. It used to work when i plug in my headphones and now it works and breaks. Is there anything else i can do or should i go replace something?

Your problem can be either due to a software or hardware problem.
SOFTWARE:
Try to restore your iPhone - http://support.apple.com/.../kb/HT1414

HARDWARE:
Take your device to an Apple Store or authorized store to check the problem

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