Computer Hardware
ESD damage can be caused by:

Touching metal on the chasis
None of these
Placing an IC on a grounded mat
Placing an IC in a non-conductive plastic bag
Repeated sags in current supplied from outlets

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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:

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

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