The high-pitch beep is the system alarm, and in desktop systems is built into the mobo. However, in laptops, the system alarm runs through the speakers. So your speakers are fine. Try deleting all of your speaker drivers and then restarting your laptop. Then install the ones that came with the system, and restart it again. If something is still screwed up, you might want to call toshiba. I am not very familiar with laptops, as i have never owned one. But good luck, and i hope it works out.
Intel Conroe e6750
SLI EVGA 8800gts KO's
4GB Patriot DDR2 800mhz
22" Widescreen Sceptre LCD monitor 5ms
OCZ 700W psu
320gb seagate w/ perpindicular tech.
Creative SB X-Fi Fatality
Thermaltake Armor: Extreme Edition