>>SNIP
>>>>
>>>>Can't you use sound instead of messing with the keyboard lights?
>>>
>>>What is a computer doesn't have a sound card? My at work doesn't...
>>
>>But it can still BEEP.
>
>How? I tried ?chr(7) - no sound. Is there another way?

It is possible that you don't even have a speaker plugged in..
When you turn on the PC do you get the (Post) Double beep?