How to Bootup from a USB Flash (MacBook Pro)?

[vmars316]

Greetings,
I inherited an older intelBased MacBookPro.
I don't know how to do anything yet.
But I would like to get it to BooUp from a UsbFlash .
Pls, how can I do this ?
Thanks...Vernon

 

[simsaladimbamba]

Holding down the OPTION/Alt key after the startup sound gives you a selection of bootable systems connected to that Mac.

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

 

[vmars316]

Here
https://help.ubuntu.com/community/MactelSupportTeam/AppleIntelInstallation

it says:
Be aware that it keeps being tricky running Linux on a Macintosh

Is this still true ?

I would like to run LinuxPuppy on macBookPro 3.1 .
Or at least fullLinux on macBookPro 3.1.

Possible ?

Thanks...Vernon

 

[vmars316]

...Also:
At bootup, I held down the alt/options button.
But the only option was 'boot up from hardDrive'.

Is there any way to BootUp from flashDrive ?
Thanks...Vernon