I have a Antminer S2 from the second batch, it was all fine for a few day's after putting the blades back like most of you 
Until today, i restarted the damn thing and now there is nothing but blue on the screen.
The original sd card seems to be fine, new msd card with a new image does not help.
I even tried with all the blades out, only one and half of them, still nothing
Do you guy's know what could be wrong?
When I've had this problem, it's been the SD card, try re-imaging it with the image from 1l1l11ll1l. If you need to power your machine down, first eject the card (no need to completely remove it), then power off, then push it back in and power on again. I've had no more problems since following this routine.Until today, i restarted the damn thing and now there is nothing but blue on the screen.
The original sd card seems to be fine, new msd card with a new image does not help.
I even tried with all the blades out, only one and half of them, still nothing
Do you guy's know what could be wrong?