1785 error comes up if "A Smart Array Controller is installed but not used". I guess you are not using B120i so this error is coming up. Refer to this doc about 1785 error.
That seems logical, I just wish there was a bit more verbosity to let me know for sure that the controller in question is the B120i. But, that can be left as an exercise for later I suppose.
1719 and 1785 are pretty self explanatory about controller failure.
(I think you meant 1783, and not 1785)
I would argue that they aren't particularly self explantory, especially since the error doesn't tell me which controller is suspected of having failed, and how. No other indication exists that there is a controller failure. No other data source tells me what that failure might have been. The POST screens don't say a failure occurred. The controllers themselves don't report any errors. It's rather strange and unsettling. I hate being tempted to simply ignore warning messages. However, in this case, I'm not sure if I have much of an option.