2008 iMac - No Display


i have 2008 apple imac turns on (i can hear fans spinning), doesn't show on screen, black. no sound either. have installed new ram (compatible - ifixit.com), no display still. have reset smc/pram, same result. ordered mini-dvi hdmi adapter can connect external monitor see if picture, update pending. other that, have other recommendations?
--- post merged, jan 7, 2018 ---
update: took apart imac , checked diagnostics lights , both 1 & 2 solid green when power on, 3 & 4 off. read, seems graphics card. know if can uninstall graphics card , still use imac or "have to" have 1 installed?

reference link: https://www.ifixit.com/guide/imac+intel+24-inch+emc+2134+and+2211+diagnostic+led's/7443
 

you need graphics card display anything. 2008 (have 1 myself) past point worth fixing. might find repair shop try fix it, apple not @ it.
 


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