Currently Being ModeratedFeb 12, 2012 2:13 PM (in response to Chris Williams Vanderbilt)
I've got the exact same problem with my 20" ACD. It worked fine previously, just out of no where it give me the short, long, short blinks. Pluging the 20" into my 23" adapter made it work also.
Currently Being ModeratedApr 21, 2012 10:46 AM (in response to jameshong)
I would gladly point you to another thread here, which is kind of a reference on the "short-long-short error code.
Happy reading and good luck!