Black screen no chime

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you may have seen other post talk swapping out displays 8,1 imac 7,1 went ahead , swapped on screens ( , while @ dvd drive 2008 bit better)

first of put 'bad' mac (with fans spinning , suspected bad logic board).

fired , still fans spinning booted fine straight yosemite albeit yellowy screen happy @ point...

goes wrong

reassembled 7,1 odd , display 8,1 id swapped...

doesn't boot or chime, fans spin @ slow speed have 3 leds of 4 lit

read online psu fault... not stole otherone test...

im @ real loss having 2 decent imacs less week ago have none great?
 

just swapped graphics cards between 8,1 , 7,1 8,1 boots fine 7,1 has 3 leds on still :( im stuck don't know whats left except logic board don't understand how break disconnecting lcd tem sensor , lvds cable :(

have 2 imacs looks of both bad logic boards :( ideas else try?

in advance

oh yea , have put how started morning , still no dice :(
 


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