Is it likely that a malfunctional PC internal speaker can make a PC appear "dead?"

[trevor sealy <squaremile1966@juno.com>]

Hi Debian,
I turned on my PC as usual which did not run POST and there were no beeps
from my internal speaker to indicate a POST error. There was no video,
and hence no error messages. My system appears to be dead - although the
fan on the CPU and  the system fan are obviously running, and the LEDs on
the front panel are lit. I bought a POST card and tested the system and
got "FF";and according to the code book the system passed the POST.
Is it possible - is it likely that my internal speaker might be causing
my system to appear to be dead ?

Thank you.
Squaremile.