Macbook pro 2012 will not boot from usb

gptrent Said:

"Macbook pro 2012 will not boot from usb. Other macbooks boot from the same usb stick"

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Reset your SMC and your NVRAM:

Sometimes changes (i.e. Installations) are made to the system and then settings (i.e. USB Ports) become corrupted, technically. So, reset both on your Mac. So, reset the SMC and reset the NVRAM or PRAM. It might take three tries. to fix this. So, be certain you have the time to do so.

Start With This:

• How to Reset the SMC of your Mac - Apple Support
• Reset NVRAM or PRAM on your Mac - Apple Support

What errors arise when you try to boot the USB device?

Possibly obvious question: is whatever being booted from USB supported on the MacBook Pro circa 2012?

Are the other Macs involved here newer or older?

All devices, or does this problematic Mac correctly boot from other USB devices?

gptrent Said:

"thanks for the advice. I reset the smc, nvram/pram at least three times and still no luck booting form the usb stick. after the MB boots it recognizes the USB as the Catalina install disk."

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You are welcome.

Create an ew installer, and try using it on this Mac.

gptrent Said:

"I reset the smc, nvram/pram,again... It worked this time...thank you"

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You are welcome.