[Edited Message Follows]
A little more information is required to assist.
What OS version do you have. Did you change the
OS version from the last time it worked.
What version of FLDIGI are you using.
You can get garbage output in the absents of a
signal, that does not necessarily mean anything
other then to say that the squelch is set low
(Radio and/or FLDIGI).
Here is a simple test to rule out a few things.
Under Configure->Soundcard->Device
settings (FLDIGI) select "Microphone" for
Capture and "Speakers" for playback.
Place any headset/speakers to the computer with
volume turned up in order to listen.
Copy this (following text, between the -----
lines)
------------------------
To be on not to be that is the question ^r
------------------------
Paste it into the transmit panel.
Do not hit transmit button yet, and turn off the
connected transmitter if it's on.
From the FLDIGI's menu select
"File->Audio->TX generate". When it asks
for a save location, note file name and save it
to the desktop.
Press the T/R (on FLDIGI).
Do you hear digital audio output from the
speakers/headset and see a digital signal on the
waterfall?
From the FLDIGI's menu select
"File->Audio->TX generate" a second time
(turning it off).
Do not change the modem used to make recording
during playback.
From the FLDIGI's menu select
"File->Audio->Playback" locate the audio
file saved. Default name: generate.wav on
desktop. Once found mouse click the file, and
press open.
You will be asked if you want play the file
indefinitely, your call as to which.
Do you see a digital signal on the water fall
that matches what you sent? In the RX panel do
you see the following text? "To be on not to be
that is the question".
Select "File->Audio->Playback" a second
time to disable indefinite playback.?
If you have a microphone connected, when
speaking into it do you see any changes in the
waterfall that a signal is present and
correlates with your speaking?
If so, then the likely issue follows:
The Audio capture/playback device is not set to
the correct device.
Which might imply,
? ? a) Select the correct audio device from the
configure dialog (FLDIGI).
? ? b) You need to set permission for FLDIGI to
have access to said device.
? ? c) You need a device driver is order have
access to said device.
? ? d) Cable/Interface that connects between
your radio and computer is; missing, loosely
connected, or defective is some fashion.
? ? e) The radio is not set to take input/output
from the computer interface. (Edit:Added)
Don't know how much more I can assist you as
I'm a hand on person in order to troubleshoot
issues. But, let me know if you need help on
the stated corrective suggestions.
Robert