All sound gone !!!

I am using HP Probook 4420s . Suddenly I am facing several problems in my Probook . Power Button is not working , All sound gone (Speaker,Headphone etc.) When I Press F5 button , then probook get started and says- 'BIOS application missing or corrupted' , After pressing Enter probook get started normally but missing all sound everywhere..... If I press Left Ctrl button then probook gets Off .
What should I do now ? Please give some relaiable solution ... Thanks in advance.

Cheryl Ebs wrote:
I do have sound if I plug in ear phones, Do you think my speakers blew?
A PRAM reset might be all you need if it's a simple hardware issue.
To Reset PRAM:
Shut down your computer; then turn it on again and immediately hold down the Command-Option-P-R keys. When you hear the startup sound for the second time, release the keys.
IMPORTANT: Resetting parameter random-access memory (PRAM) may change some system settings and preferences. Use System Preferences to restore your settings.

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All sound gone !!!

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