Boots Black screen

Hi.
I’m new to this and haphazardly formatted my old Macbook Pro to run Ubuntu recently.
It worked for a bit, I got the wifi to work and installer a bunch of other drivers, next time I booted it all i got is a Black screen and a cd-drive Sound.
After an exhaustive search, I’m fairly sure it’s the same EFI issue as describes here:
https://discussions.apple.com/thread/5051884
My question is: How do I get it to boot from the boot menu or any other way to boot from a usb drive?
I have tried all of the ‘F’-keys, esc, right and left shift, cmd, alt and a few recommended combinations.
Halp!

Did you try booting with just the alt/option key? What shows up?

I thought I had tried that, but gave it a go anyway, and now it boots just fine. What a relief!
And thank you!

Quote:

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Originally Posted by linejs

I thought I had tried that, but gave it a go anyway, and now it boots just fine. What a relief!
And thank you!

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Great. Way to break on through . . . to the other side . . . .