Apple Macbook Pro's fan spinning but not booting up

Main Logic Board malfunction is a possibility but there are some other things to check.

1- Is there any kind of backlight activity on the screen?

2- You should connect an external display (Thunderbolt 2 adapter) and see what happend after pressing the power bottom.

3- Try to boot an external bootable disk, maybe the HDD flex is gone (very common issue on this MBP)

The 2012 MBP is very DIY friendly if you have some knowledge, do your research and give it a go. If you are not confident enough take it to Apple or an AASP.

Start a service request

https://support.apple.com/mac/repair/service

Harsh_7705 wrote:

All of a sudden my MacBook Pro starts having problems. I have tried different things as per internet suggestions, but as yet had no luck figuring out what is wrong with this laptop.

When I go to boot up the laptop by pressing the power button, the fans start spinning and the sleep LED lits up and to my surprise it starts charging as well when I plug it in, but nothing else on the screen, either chime nor apple logo . When I hold down the power button for a few seconds, the fans stop spinning and the sleep LED also goes off. As soon as I press the power button again, same thing. I have tried SHIFT+CTRL+OPT+POWER, resetting the SMC, power cycle. But no change in the condition.

Can anyone please assist?

If your Mac doesn't start up all the way

https://support.apple.com/en-us/HT204156

13", 15", 16"?

non-T2 or T2 MacBook? (model year will define if it's one or another)

We need more data...

Harsh_7705 Said:

"Apple Macbook Pro's fan spinning but not booting up: All of a sudden my MacBook Pro starts having problems. I have tried different things as per internet suggestions, but as yet had no luck figuring out what is wrong with this laptop.[...]"

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Troubleshooting Mac Power:

Refer to the following....

Start with Safe Mode:

[Hold Down: the shift key upon boot]. In Safe Mode, login items do not open at login, and preferences are set aside. These preferences may be getting in the way.

Try the Following Links:

A. Try a New Charger:

• Power & Cables - Mac Accessories - Apple - Select "Mac Compatibility" on the left
• Find the Right Power Adapter and Cable for your Mac Notebook - Apple Support

B. A Few Links to Refer to for Power:

• If your Mac doesn't Turn On - Apple Support

• About Mac Notebook Batteries - Apple Support

• How to Turn your Mac On or Off - Apple Support

• If your Mac Battery won't Charge - Apple Support

• Charge the MacBook Pro Battery - Apple Support