Most likely a defective antenna connection. Two ways to fix this. (1) obtain an external "puck" type antenna with an SMA connector and plug it into the back of the Quest. (2) If you feel comfortable soldering small circuit pieces, remove the flip up antenna by placing the quest face down on a table. Remove the right two screws from the back and carefully remove the end cap holding the flip up antenna in place. Be careful removing the antenna endcap because there is a small plastic piece and a spring that can easily fly out and get lost. Gently pull the antenna to the right, away from the GPS, removing it completely.
Take a small flat blade jewelers screwdriver, pry the pieces of the antenna shell apart exposing the antenna circuit board. There is a small gold colored antenna connector on the left side of the circuit board. Very lightly apply a very small amount of heat to the solder connections. Just barely enough to melt the solder. Reassemble the antenna and then the antenna to the Quest, making certain to include the small plastic piece and spring and then tighten the endcap and screws in place.
I have repaired quite a few Quest units with this procedure and have had only 1 that did not work afterwards and that was because the antenna itself was bad.
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