PH317-51-787x won't turn on after replacing thermal paste

Hi all. Today, I decided to clean the insides of the laptop and replace the thermal paste. I accidentally pulled the CMOS battery and re-connected it after a few minutes. Now, the laptop won't turn on at all. The power LED stays solid blue, and the battery LED stays solid orange whilst plugged into power. But when pressing the power button nothing happens. Keyboard backlight remains off, screen remains off, no fan spin, nothing at all.

I've tried:
-double checking that the heatsink is properly placed
-performing a battery reset
-switching the RAM sticks around
-pulling the CMOS battery again for 10 minutes and putting it back

I suspect the BIOS got corrupted on the first accidental pull of the CMOS battery or something. I'm stumped. I've been handling, building, doing maintenance on all of my computers and other electronics for years and nothing like this had ever happened to me before.

Pretty please, help

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Wiewiór

Did you press the power button for 10-15 seconds? Without a bios battery, the laptop starts?

Castochi

Wiewiór said:

Did you press the power button for 10-15 seconds? Without a bios battery, the laptop starts?

Pressing the power button for 10-15 seconds does nothing different. Laptop still won't turn on.

What do you mean by without a bios battery, the laptop starts?

Wiewiór

If you pull out the CMOS battery and try to turn on the laptop, does it turn on?

FuraiChicken

This also sounds like a fried motherboard, what type of thermal paste did you use? I had a fried motherboard randomly and this was similar to my first enounter.

Castochi

FuraiChicken said:

This also sounds like a fried motherboard, what type of thermal paste did you use? I had a fried motherboard randomly and this was similar to my first enounter.

I used the electrically non-conductive Thermal Grizzly Kryonaut, so if anything shorted, it was definitely not because of the thermal paste. The USB ports receive power and are able to charge devices, if that helps.

Castochi

Wiewiór said:

If you pull out the CMOS battery and try to turn on the laptop, does it turn on?

I just pulled out the CMOS battery to try this and no dice.

Wiewiór

The problem seems to be with the motherboard. One time, a coincidence on another laptop that there was a short circuit on the power batteryand it wouldn't boot. But without it, the laptop worked fine, so try this.
Didn't you notice anything disturbing on the motherboard?
Sometimes we miss something and it's worth trying to just disconnect everything and do it all over again. It's hard to tell from a distance.

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