iMac 27" late 2011 SSD (LCD) screen wont turn on


hello,

installed owc ssd imac , after following youtube video installation put imac , screen wont start. after couple of seconds fan kick in, checked logic board , 3 of 4 leds appear.

pointers ?

thank in advance,

mo
 

might not problems mine today (see thread in imacs) way technician worked out screen , not graphics card plug monitor in. if plug external monitor in , comes on, imac screen, either damaged or not plugged in.
 


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