2016 MacBook Pro has fan running but won’t turn on.

The only other thing you can possibly do would be to try disconnecting the battery for a few minutes, then connecting it back up and see if that clears anything. That's basically what the SMC reset is trying to do, but you would be doing it physically.

If that doesn't help, or you aren't able to do that then at that point you need to pursue an out-of-warranty service diagnostic at an Apple Authorized Service Provider. They will likely charge an hour of their labor or if they have a flat-rate diagnostic fee, usually between $60-$80.

If turning on the MacBook immediately gives you the fan running at full power, but no screen or any other sign of life the logic board is likely fried.

If you turned it on and say...got life from the caps lock key, but the fan didn't immediately come on full blast then it could mean the display, display backlight, or a loose internal connector (and hooking up an external monitor in that case could work).

But no, with the fan coming on immediately and staying on...and attempts at SMC resets not helping (I would disconnect the battery for a minute to be sure) and having no USB devices plugged in, it means the logic board is almost certainly fried.

You can certainly take it into a service provider, especially if you haven't had any recent (think 6 months) liquid spills in the past, but likely they would charge you an hour of labor and tell you the same thing. Essentially, a MacBook with no screen and an immediate full-power fan having done a hard SMC reset (i.e. disconnecting the battery) is typically a sure-fire sign of logic board damage. If you truly have had zero spills though you can get it looked at to be 100% sure the prognosis is as bad as I am saying.

Hi hoa127,

​Thank you for using the Apple Support Communities. We see that your fan seems to run as soon as you turn on your Mac, and you've already tried some troubleshooting already. It's always important to make sure your Mac operates as expected, and we'll be glad to help out.

This link has a few suggestions that might help: About fans and fan noise in your Apple product. Have you checked into ventilation yet?

"Make sure the vents on your Apple product aren't blocked

Some Apple products have vents that let fans bring in cool air and expel hot air. Make sure that the vents aren't blocked to allow your device to perform at its best. 

• Apple TV 4K has a fan and a vent at the bottom.
• Airport Extreme and Airport Time Capsule have fans and vents at the bottom.
• iMac has vents along the bottom edge and on the back.
• iMac Pro has vents along the bottom edge and on the back.
• Mac mini has vents at the bottom to bring in cool air from beneath the device and vent hot air from the back.
• Mac Pro has three fans on the front of the computer and vents on the front and back.
• MacBook Pro has vents along the side and on the back. MacBook Air computers have vents along the back near the clutch. 

The surface your device rests on can block its vents, affecting fan behavior. If you use your device on a soft surface like a couch, pillow, bed, or your lap, its fans might run more. Using your device on a hard, flat surface like a table or desk is best for temperature control."

Let us know!

Take care.

If you are saying it won't turn on 100% of the time, and the most it will do is bring the fans up to full-blast by holding down the power button, then what I said I still believe is the case.

You can find an Apple service provider at https://locate.apple.com if you want a technician to confirm this or (ideally) find a different source of the problem.