[URGENT] rMBP does not work after Windows installed

[undermilli]

I recently just purchased my rMBP and installed Bootcamp ( Windows 8 )on it today .
After it restarted , it showed a White Screen for 5 minutes and then says " No bootable device - insert boot disk and press any key "
I already have a bootable Pendrive plugged into it and it still says the same .
It wouldn't boot Mac up also .
What should I do ?

 

[simsaladimbamba]

Hold down the OPTION/Alt key right after pressing the power button to get to show you all connected bootable devices and be able to select one of them.
Your Windows install is probably toast, since it is not officially supported yet, but the rest should be fine.

To learn more about Mac OS X: Helpful Information for Any Mac User by GGJstudios​

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Maybe have a look at Advanced Search or MRoogle to find threads about installing Windows 8 while you wait for more answers:

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