(Spirit and Opportunity) were sent to Mars to “Follow the Water,” recognizing that liquid water is necessary for life to exist on Earth. After establishing that Mars once had significant amount of water on its surface, the Mars Science Laboratory (which includes the Curiosity rover) was sent to Mars to determine whether Mars had the right ingredients in the rocks to host life. MEP is now developing the Mars 2020 rover mission to determine whether life may have left telltale signatures in the rocks on Mars’s surface.
Amp is not getting power
Device installed between the pre-amp and power supply, that do not state "Power passive" will block voltage, remove these items if needed. Even other amplifers installed between pre-amp and power supply can disrupt signal.
This can also be caused by using low quality cable, especially RG59 that does not have a solid copper conductor. Those cables cannot pass the voltage up to the amp over long runs. It is possible that a coax cable can be damaged, and still send a signal, but not pass voltage. Try replacing the cable between the pre-amp and power supply