only 1 light is not necessarily a bad thing, but, agree with AlexT, if console is blank then ++ungood.
I did some seriously embarrassingly bad things to one of my Edisons, and, even then, flashall+xfstk was able to put a working ubilinux back in place. (yes I know the "recovery" function in flashall was fixed such that it no longer requires xfstk. mostly. did I mention "embarrassingly-bad"?) - but even in that worst case, I still had a serial console.