and then there was 3. So I noticed 1 of the 4 remaining singles was constantly running at 700mh/s with 45-46c temps. I go to take a look to see if the front is blinking and the front led is no longer lit. Great. I go to move it to another pc too see what is going on and I hear a very slight tink, as I move it I see a very tiny led fall out. So far went from happy to a little annoyed and now to kind of pissed. I already had to pay to ship 1 single back, and I am guessing soon I will be paying for another. 
That is very bad luck rkozola.
I've got a total of 14 Singles from BFL. Not one has had a problem. 4 of them arrived this week. Reading through the forums there is some talk of the heat sinks coming loose in shipping but problems like yours are far from the norm.
Being DOA or nearly DOA like yours were I'd at least ask Sonny if BFL can cover your shipping costs.
Out of curiosity, have you tried another power supply on the single with the light out? The power supplies have been a problem occasionally. One of my power supplies died and behaved like yours. Singles themselves have been solid though.
tried the unit on a power supply from one that is working well, started mining and after about a minute it just stay between 500-700mh/s with temps at 45-46c. Ran the light diagnostic and after getting to 100 had 22 Throttles in about 600 seconds run time. Hard to tell if it is throttling since the led fell out.
I was amazed that I got a calling so quickly on a Friday evening after the email about the first one. So at least it looks like they are standing behind their product, just hope I end up satisfied with the issues relating to the first and now the second problem I have had.