If the fan is spinning and there is no image or chime it’s not a good sign. If you haven’t got another shell to test the screen I would try the following.
· Check for liquid damage on both sides.
· Do a PRAM/NVRAM reset.
· Insert a bootable USB drive with a light and see if it gets activity by the light flashing if it doesn’t it would point to CPU.
· Disconnect the battery and connect magsafe.
· Disconnect all flex cables on the board except the 6 pin power cable and connect magsafe.
I have found with this model it’s usually a dirty Bios file or faulty CPU if the above don’t help. Most likely CPU but you would need a reputable repair shop to confirm.
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