My Mac book pro displays black screen says no bootable device insert boot disk. I have no boot disk to insert. What should i do.no bootable device"

My Mac book pro immediately displays black screen when I start up and says no bootable device insert boot disk. My question I don't have boot disk nor recovery disk to restore the system. Urgently needs your support and help.  Thanks in advance.  Michael l. Lluch

Hello
any chance you have try a bootcamp / win install into your Mac ??
if so
try this to boot into mac os
restart your mac , just after start up sound hold on "ALT" key to sart on drive manager
if that work select mac os volume using arrows key and validate by enter
HTH
Pierre

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