Chosen Solution
Since doing a PRAM reset, my fan is now constantly running upon start-up. I have tried the SMC reset with no luck. Upon releasing the Shift-Control-Option and power buttons, there is an automatic start-up. It does not give me the option to repress the power button as instructed. Please help. Thank you!
Sadly, you appear to have a deeper issue on your logic board. It might be possible to repair yours, but thats going to take a bit of time given the current state of affairs. The other option is replacing the logic board. This does offer an opportunity to upgrade if you’ve found your system was running out of RAM or storage.
You could try restarting in safe mode by holding down the shift key immediately after pressing the power button. this might help https://support.apple.com/en-us/HT201255
