Sony PCG-XG28 Primary User Manual page 108

Check that the phone line is plugged into the line jack. See
"Connecting a Phone Line" on page 60 for details.
Check that the phone line is working. You can check the line by
plugging in an ordinary phone and listening for a dial tone.
Check that the phone number the program is dialing is correct.
Check that the software you are using is compatible with the
notebook's modem. (All preinstalled Sony programs are compatible.)
The computer's modem uses 56K technology and V.90 capability. Many
factors influence modem connection speed, including telephone line
noise or compatibility with telephone equipment (such as fax machines or
other modems). If you think your modem is not connecting properly to
other PC-based modems, fax machines, or your Internet Service Provider,
check the following:
Have your phone company check that your phone line is free from
any line noise.
If your problem is fax-related, check that there are no problems with
the fax machine you are calling and that it is compatible with fax
modems.
If you are having a problem connecting with your Internet Service
Provider, check that the ISP is not experiencing technical problems.
If you have a second phone line available, try connecting the modem
to that line.
If you are using an external microphone, check that the microphone is
plugged into the Microphone connector. See "Connecting an External
Microphone" on page 79 for details.
If you are using an external mouse, check that the mouse is plugged
into the mouse connector. See "Connecting an External Mouse or
Keyboard" on page 67 for details.
If you connected an external mouse while your computer is on, you
must restart your computer.
If you are using an optional Sony USB mouse PCGA-UMS1 or
PCGA-UMS1/A, check that the mouse is plugged into the USB
connector.