to be on the safe side first do a [https://support.apple.com/en-gb/HT204063|PRAM reset] and an [https://support.apple.com/en-gb/HT201295|SMC reset]. If this doesn’t work are you able to boot into network recovery on the internal display? This will rule out a software issue.
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To be on the safe side first do a [https://support.apple.com/en-gb/HT204063|PRAM reset] and an [https://support.apple.com/en-gb/HT201295|SMC reset]. If this doesn’t work are you able to boot into network recovery on the internal display? This will rule out a software issue.
See this guide on booting into network recovery: https://support.apple.com/en-gb/HT204904
to be on the safe side first do a [https://support.apple.com/en-gb/HT204063|PRAM reset] and an [https://support.apple.com/en-gb/HT201295|SMC reset]. If this doesn’t work are you able to boot into network recovery on the internal display? This will rule out a software issue.
See this guide on booting into network recovery: https://support.apple.com/en-gb/HT204904