Laptop Sound

[Kangaair]

Hi all,
I have a small problem with a Compaq Presario 1700T laptop that I just bought. I'm not getting sound from the left speaker even if I hook up external speakers.
I have all ready checked to make sure the balence is centerd. It makes no difference if I'm playing sounds from file or cd dvd. There isn't even a hiss comming from the left speaker. I figure it is something to do with the sound card, can one be installed or is it all on board. Is there any way to use an external sound card? I hope I have explained this well enough so you may help me, if not, let me know. Also, is there any way to access the bios?
Lee

[Kangaair]

Thanks Y'all
I found what I was looking for. I can get what I need ether in usb or cardbus from $ 30.00 to $400.oo US.
Lee