Mac Pro 6.1 not booting up, loud fan noise, red and orange lights coming from the bottom | Mac Help Forums
![2013 iMac high fan speed, internal display not working - now with error codes - Other Hardware - Level1Techs Forums 2013 iMac high fan speed, internal display not working - now with error codes - Other Hardware - Level1Techs Forums](https://forum.level1techs.com/uploads/default/original/3X/d/a/da944d6c2bb07ca0a62b5012b6b91ff30e456f14.jpg)
2013 iMac high fan speed, internal display not working - now with error codes - Other Hardware - Level1Techs Forums
No internal video, high fan, and throttled CPU after replacing HDD - iMac Intel 21.5" EMC 2638 - iFixit
SOLVED: Missing resistor, SMC and/or temperature sensor failure iMac late 2013 - iMac Intel 21.5" EMC 2638 - iFixit
Display not working after SSD swap...VFD001 and PFM006, no LED 4. - iMac Intel 21.5" EMC 2638 - iFixit
SOLVED: Missing resistor, SMC and/or temperature sensor failure iMac late 2013 - iMac Intel 21.5" EMC 2638 - iFixit
![2013 iMac high fan speed, internal display not working - now with error codes - Other Hardware - Level1Techs Forums 2013 iMac high fan speed, internal display not working - now with error codes - Other Hardware - Level1Techs Forums](https://forum.level1techs.com/uploads/default/original/3X/8/a/8a0431515f7f32d7a60af3b25d9314ef4cf10848.jpg)