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Why Won't My MacBook Turn On?

Last week I received a (refurbished) MBP 2019 that I often use with a Dell U2720Q monitor (it connects via a USB-C and also charges the mac) I have had a couple occasions where in the morning, this mac does not turn on. I continue to try to hold the power button for 10 seconds, do an SMC reset, try powering on every so often, and only after a few hours does the mac respond and turn on. First time this happened it took me more than a night to get it to turn on. Next time this happened in the morning, and 3 hours later it finally turned on. What could be the issue here? Is it possible that the USB-C from the monitor is harming the hardware somehow? Thank you for your insights!

Best Answered by

iBoysoft author Vain Rowe

Vain Rowe

Answered on Monday, July 10, 2023

Hi there, it is difficult to tell whether the Dell monitor or the USB-C cable is the culprit, you're recommended to make a test by unplugging the monitor and trying an alternative cable respectively. On top of that, there are some other solutions you can try :

  • Detach all external devices from your Mac
  • Reset the SMC
  • Let your MacBook charge for a longer time
  • Perform a power cycle on your computer
  • Check the display brightness settings or try to use an external monitor
  • Seek repair service

For more information, please visit this article from the iBoysoft website: MacBook Pro/Air Won't Turn On or Start? Make it Boot Now

Good luck~


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