Cinema HD Display not working - flashing lights

Hi

Ii have two 23" cinema HD displays on the mac listed below. they have worked fine for ages, but today i turned on and one of the displays did not come on, instead the power light flashed periodically with a long pause then a short flash, long flash and short flash.

i have searched for solutions and i found this article for LCD displays:

http://support.apple.com/kb/HT2811

which stated that this kind of flash means the power adapter isnt working, but i tried swapping the adapted/power cord with the other display without luck.

this other article:

http://support.apple.com/kb/TA40898?viewlocale=en_US

which states it may be the backlight, but i wanted to try here to see if there was any other potential solutions, if not whats my best bet with getting it resolved?

things ive tried:

i tryed the problem display on it's own to make sure it wasnt a problem with having dual screens, it still didnt work.

I tryed swapping the power adapter, the adapter seemed to work fine with the working monitor, and the other one didnt help with the faulty display.

I tryed both display sockets in the back of the mac to make sure the connection to the mac wasnt the problem.

i thought the cable which runs to the display to the power adapter may be worth trying to swap, but while i thought this was removable i couldnt seem to disconnect it from the back of the display and didnt want to pull too hard incase i broke it is it fixed?