You have just finished installing a hardware device on your computer's lone serial port. The computer also connects to the Internet using a modem that is installed on the computer. After restarting the computer, the recently installed device is not working. What could be the reason and how to troubleshoot this problem?

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You have just finished installing a hardware device on your computer's lone serial port. The computer also connects to the Internet using a modem that is installed on the computer. After restarting the computer, the recently installed device is not working. What could be the reason and how to troubleshoot this problem?