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Do a quick check to see if preamp power is getting to the amplifier module. Use your multimeter AT THE AMPLIFIER's signal out/power in connector to check for the +15 VDC from the indoor supply. Simply disconnect the coax lead from the amp and measure between the shield and the center conductor of the coax. Anything between 12 and 18 volts is expected.
If that passes, we've at least eliminated power to the preamp as a cause. You can then do the troubleshooting one of two ways: Either break it down to individual sub-components and verify each, then integrate one step at a time retesting at each or you remove or bypass a single component at a time and see when it starts to work.
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