I had an Acer Predator Helios 300 PH317-54-75K8 (MB 6050A3087503-MB-A01(A1)) brought by a client for internal cleaning due to overheat.
Easy laptop, simple proccess, I have done it hundreds of times (literally), didn't even need to remove the motherboard. Just disconnected the battery, the fans, carefully removed the heatsink not to stress CPU and GPU, cleaned, repasted and put back together.
After I assembed it, to my ultimate surprise, the laptop didn't POST. Keyboard backlight lights up, screen does a momentary flash, and then nothing.

It did a sound on POST when...
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