Can you get the magnetometer board on the bench with a DVM ?
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Does the analogue output change as you move the board. There are many reasons why the outputs could be up jammed up high or low, but the obvious thing to check out are the supply voltages, maybe you have lost the negative rail.
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If the analogue output of the board is normal and does alter, it probably is a problem with you Labjack connection.
Can I ask for some help with my UKRAA magnetometer ¨C the trace is appearing as below ¨C I am using an older UKRAA magnetometer with parallel port ¨C so data collected using the analogue outputs and Labjack U3.