In this video I'll show you how to solve the issue of a macbook pro, usually 2011-2012 models, stuck at booting screen either blank screen or loading bar not moving. The solution entails disassembling the laptop and extract the motherboard and "cooking it up" using a heat gun at approx 200° C or 390° F for about 5 minutes. This helps reestablish processors connections to the motherboard that sometimes fail due to poor cooling that in turn is due to clogged heating sink. So I recommend doing a periodic maintenance to the fan radiators.

Try this method only after having tried all the other possible solutions:
Booting from an external drive with macos installed on it
Booting from Safe Mode
Resetting PRAM and VRAM
After checking HDD drive health

Wish you good luck!

For buying tools and items for the job:
* Heatgun
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* Thermal paste
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* Screwdriver set
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