I started over and read each post you've sent again and noticed something that I missed, you have drivers 16.9.2...
per claymore's recommendations For 4xx cards (Polaris) Crimson 16.12.2 is recommended.
Run DDU in safemode, then install 16.12.2 and test IF THAT still doesn't solve the issue:
Take out ALL OF the gpu's except 1
download and reinstall the mining software, leave it in your download folder DO NOT have it on the ROOT
make sure you put an exception in the antivirus software for that folder
setup the config file and then run it.
does it work with one GPU only? if yes, load the second one, does it work, if yes repeat
try a different card , still no
you may have a bad connector(s)