Resolving Software And Hardware Incompatibilities - Dell Dimension XPS D Series Reference And Troubleshooting Manual

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In general, modem malfunctions may be caused by any of the following problems:
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Incorrectly installed modem
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Interrupt request (IRQ) conflicts
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Incorrect information (.inf) files
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Multiple drivers installed
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Incorrect Plug and Play configuration
To troubleshoot a modem card, follow these steps:
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Refer to "Resolving Software and Hardware Incompatibilities" in Chapter 5.
Resolve any modem IRQ conflicts and restart the system.
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a. Click the Start button, point to Settings, and click Control Panel.
b. Double-click Modems in the Control Panel. Remove any invalid or unused
entries from the list. If you are using Windows NT, check the modem proper-
ties and then proceed to step 3.
c. Click the Diagnostics tab.
d. Highlight the COM port that the modem is using.
e. Click More Info to verify that the system can communicate with the modem.
If the modem reports information to the system, the modem is operating
properly.
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NOTE: Windows NT does not support Plug and Play ISA devices. Jumpers are
used to manually configure the modem for a specific COM port and IRQ.
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Checking Inside Your Computer 6-3