IBM 6644 - Manual (Page 65)

52 User Guide
Memory problems
Modem problems
Symptom Action
The amount of memory
displayed is less than the
amount of memory
installed. The amount of available memory shown might be somewhat
less than expected because of basic input/output system
(BIOS) shadowing and other resource requirements (such as
ACPI and USB).Verify that:
1. You have installed the correct type of DIMMs for your
computer. See “Installing memory” on page 37.
2. The DIMMs are properly installed and securely
connected.
3. If you added or removed memory, you saved the new
configuration before exiting from the
Configuration/Setup Utility program.
If the problem persists, run the memory test from the
diagnostic program supplied with your computer. (See
“Running the IBM Enhanced Diagnostics program” on page
57 for further information.) The computer might have
detected a bad DIMM and automatically reallocated memory
so that it could continue to operate.
If you cannot correct the problem, have the computer
serviced.
Symptom Action
When you try to use the
modem, your computer
or modem is unable to
detect a dial tone. 1. Make sure the telephone line is correctly connected to
your computer. If you are using other communication
devices in conjunction with the modem, such as an
asymmetric digital subscriber line (ADSL) adapter or
home networking adapter, refer to the documentation
for those devices to ensure the cords are properly
connected.
2. Make sure no one is using the telephone.
3. Make sure the telephone line is working.
4. Add the modem command
x3
to the initialization string for the communication
program you are using. For help with changing the
initialization string, refer to the documentation that
comes with your communications program.