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Hi Please I need Help ! long story , I took my Imac to apple care for replacing Video card because the vertical green line conman issue . then after they replace it , it work fine . problem start when I try to upgrade HDD with New HDD . I did replace the HDD then I finished reconnected all the cable of LCD. when I turn my Imac I smell something got burned ! I found out the connector (molex ) of the Display Port Power Cable got burned and also one small chip below the connector too . so I disconnect all the cables of LCD, I did reattach the old Original Apple HDD , I contact my Imac Via TV by HDMI Cable , it work fine bootable I reached my desktop file . ! but the Fan work Loudly and full speed .

  • I installed ( HDD Fan Control ) application it show , HDD 1024 PRM , ODD 3234 PRM , this app couldn’t solve the problem or control the Fan I tried all option of app Auto, Manual, Smart .
  • Idid SMC reset and PRAM reset nothing solve a) my question first : is there hope to use LCD which option I must go with on this case : 1- got new Display Port Power Cable only ! 2- replace the cable + connector (molex) + the small chip 3- replace the logic bored B) my second question : I can live with Via Monitor rather than using LCD but how I will solve the problem of full speed loudly fan ! I wonder if the burned chip could effect the logic board . I did attach Photo on the Link below :

Notice : done SMC reset and PRAM reset nothing solve Thank you for your time anything will be helpful

Let’s start with the run away fan issue. Get this: OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade https://eshop.macsales.com/item/OWC/DIDI…

looks like you plugged in the DP PWR cable backwards and both the Inductor and 6 pin Connector went up in smoke. your picture shows bad damage where 3 solder pads are actually missing from the Logic Bd. so for Question A) you would need new Logic Bd. and new DP PWR cable. If you look at the DP PWR cable the mating connector on that is probably also damaged. So both male + female connector for DP PWR smoked.