No Backlight No Display 3 Diag Lights on
I purchased this iMac with the intention to repair to sell for more. I have some Ideas that it may be the logic board or just a bad video card.
When the unit is off and the power cable is in, LED #1 is lite, during start up LED#2 and LED#3 light up and all three lights stay on. I then hear the Macintosh chime. After giving the system a chance to boot up (fans running, hard drive is working) I can press play and listen to my iTunes library no problem...except I can't see the screen. Nor an image or back light on the internal LCD, with hopes of it just being a bad LCD I connected it to my TV via Mini DVI>DVItoHDMI Converter>HDMI Cable. I was unable to receive an image on the screen, is it possible it's the crazy cabling or bad video card? Bad logic board? I'm Stuck on this one, I consider myself a fairly techy guy but this one I need help confirming before attempting to fix or deciding to sell.
Things I have tried thus far:
I attempted to reset the PRam, after first reset the startup chime is now louder.
I checked and re-seated the ram, changing slots.
If this was possible I did a SMU/SMC? without opening by removing the power cable from behind the unit, waiting 15s secs, holding power for 5 seconds, then plugging back in, then powering on.
Is this a good question?