Can't hear anything on my computer (Windows 7)?

Please Read it will help me out a lot! :]

my Toshiba laptop doesn't have genuine windows 7, but that hasn't been a problem until today(i think).so when i turned on my computer today i forgot to plug in the charger, obviously i remembered when my screen turned black and i plugged it back in. I don't know if that triggered some error, but now i can't heart anything from my computer. I tried updating systems for my laptop(Toshiba updates) and still nothing. I went online and it told me to mess around with my sound settings in control panel. Still nothing. I can't hear YouTube, the log-on sound(window sound). BUT, i can hear with earphones on(the iPhone ones). Please help!

P.S and the battery icon says that i need to change my battery.

That has happened to me just get speakers or get professional help

You can try this. It might work.
I have had this to work on a lot of computers.
If you are using windows 7 Vista also, I think.
click start <> in the search box type in audio.
From the list <> click on Find and fix audio playback problems.

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