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If your not using it then don't worry about it. But motherboards don't come with a modem port. A modem port is on an add on card like a PCI Modem. Take out the old one and insert another and load the drivers from the included CD that is the cheapest way.
Buy a new motherboard and replace the old by the PC engineer that fixed the same PC unit.
a. Replace the motherboard. b. Disable the modem port and install a modem card in an expansion slot. c. Use an external modem that connects to the serial or USB port. d. Return the motherboard to the factory for repair. If the motherboard is important, replace the motherboard. Other components may be failing and undetected. If the motherboard isn't in a critical piece of hardware, I would simply turn the modem off in the BIOS and add a new modem in an expansion slot.
Because you can change the settings to the CMOS setup by pressing a key or combination of keys during the boot process, whereas you have to open your PC to change jumpers or switches.
Check BIOS settings, make sure that the adapter is enabled. Check that the cable is not damaged and working properly. If you have burned the port. You can get a PCI extension port with Network Interface Port.
Note that "least expensive" is two words. The least expensive item in our restaurant is the white rice.
Formica or laminate it is the least expensive.
The least expensive car is probably the Tata Nano.
The least expensive mode of transportation is by water. It is fuel efficient, less polluting and the safest. It is also the least expensive to move cargo.
A gaming motherboard should have at least two PCIe slots for Crossfire or SLI video cards.
bananas are the least expensive and most popular fruit.
You can't, at least not yet anyway.