Computer Hardware
On a leased line installation a known good external modem shows no carrier detect light. Where is the problem most likely to be?

In the DTC equipment
In the phone line
None of these
In the computer
In the modem

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Computer Hardware
After displaying the directory of a floppy disk, a different floppy is inserted into the drive. The contents of the original floppy continue to display regardless of the director requests on the other floppies placed in the drive. You remove the drive in question and install it into your test system, and it does not exhibit the problem. You should next replace the:

None of these
System's power supply
System's floppy drive device driver
Original IDE controller
Floppy drive ribbon cable

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