How to Reset a Logic Board

Power off and unplug the computer.
Remove the side cover of the computer case.
Locate the jumper on the logic board to clear the CMOS NVRAM. Refer to the motherboard manual for details.
Move the jumper to the 'clear' position. Typically, the jumper resides on two of three pins. By moving the jumper to include the missing pin, the CMOS NVRAM is reset.
Move the jumper back to the original position.
Replace the computer's side cover and power on the computer. The logic board has been reset.
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How to Replace a Hard Drive in a Macbook Air

Place the MacBook Air on a clean work surface, so that the bottom of the computer is pointing up. Remove the screws around the perimeter of the hard drive using the Phillips-head screwdriver. Lift the bottom of the case off the computer.
Locate the black cable running from the large black battery to the logic board. Lift it off the logic board carefully. Unscrew the battery from the case, using the Phillips-head screwdriver, and then lift it out of the case.
Locate the hard drive in the upper-left corner of the case. Locate the orange ribbon cable that goes over the hard drive. Pull the black pull tab that secures the ribbon cable to the logic board and lift the cable off the logic board. Pry off the ribbon cable connection from the speaker to the logic board, using the spudger.
Unplug the audio-out cable socket from the logic board, using the spudger, then pry the hard drive cable connector off the board, using the spudger. Pull the black cable, located above the hard drive, in the seam between the case and the drive, out of the case using the spudger, then remove the screw cover from the hard drive bracket, using the Phillips-head screwdriver. Unscrew the hard drive from the case, using the Phillips-head screwdriver, then lift the hard drive out of the case.
Push the hard drive out of the case, then pull the rubber shock isolator off the hard drive. Remove the ribbon cable from the hard drive, using the spudger. Install the ribbon cable into the replacement hard drive and install the rubber shock isolator around the hard drive. Push the replacement hard drive into the case with both hands. Reinstall the drive in the case with the Phillips-head screwdriver, then reassemble the computer in the reverse order of the disassembly procedure.
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