System has a ventilation message Anything to look at?

So-called techs at a local repair shop failed to replace HDMI port correctly (poor solder job with loads of burnt flux, ripped pads and lack of solder). Found parts scattered throughout the shop and put it together and tested wouldn't power on. After awhile in my free time I replaced HDMI port and checked around for possible other issues. I put it together and it turns on and stays on logo for a minute or two then ventilation message. I tried 2 different power supplies and different fans. No visible issues. (Cleaned board with toothbrush and iso. New Thermal Paste. Any Other Ideas to look for?