The check valve should be inspected to see if the disc inside has come loose. This would explain why the pump did not work properly and you flooded. As for the noise there could be several factors effecting it. There are several things to look for. Make sure the pipe is braced properly and does not shake and wobble around freely. There should be a weep hole drilled in the side of the pipe just above the pump. The weep hole allows the section of pipe between the pump and the check valve to drain. By doing so the pump can get up to speedbefore hitting head pressure. The pump could also be oversized for the application. The pump maybe designed to pump against a higher head pressure amount then what you have. If this is the case it will just be noisier then apump with a lower flow rating. I hope this helps.
