No POSITION, but the fan up

I have connect a USB drive in the solid state in a 21.5 iMac, end of 2012, when the screen went black and the fan maximum.

(External SDD now seems to be dead, as well as the iMac.)

I have reset the SMC, no change.  Still no POST chime, only high speed fans.  (The fan is noisy so I can't hear if the HARD disk goes.)

Assumptions of fault?  All additional troubleshooting suggestions?  I have not watched the logic board LEDs yet.

You don't mention what brand is the external drive...?

Disconnect the external USB drive and USB devices non-essential.

Reset the SMC, according to > reset the management system (SCM) controller on your Mac - Apple Support

Then try and start up of the iMac.

If the Mac starts up, Exchange or even better to return the disc and try a different brand.

If not, then it is possible that the USB port or logic board has been damaged and you need to take a local service CENTER appointment, using the > https://locate.apple.com/

Tags: Mac

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