My Iphone4 shut off unexpectedly today. My lock button is broken and I have tried charging it for three hours. Any help?

I cannot buy a new phone anytime soon and I need to fix it tonight as I am leaving tomorrow morning for personal buissness.

I have tried plugging it into the computer but the computer does NOT read my phone.

I myself am a busy buisness woman so I can afford a new phone you see?

But why should I have to pay for their mistakes and glitches?

I do not have any attitude. I just need my phone fixed as quickly as possible.

I bet you all understand correct?

Thank you.

P.S.

My lock button is broken and I have tried all the suggestions online.

Please help.