Why I can't boot from a USB?

Hello

Why I can't boot from a USB?   I'm looking to replace a failed hard drive in a Mac Mini 2010. I replaced the hard drive without difficulty.

I have a USB flash drive from known good 10.10.5 with an Installer (tested) well known about it.   I press the power switch, as soon as the startup chime plays, I press the Option (Alt) key.

One of the two following situations occurs. Sometimes, I have a small screen asking me to enter my password Wi - Fi. I get my password and nothing else happens. Sometimes, I get a flashing "?" on a file folder.  In my view, this indicates that the computer cannot find a bootable disc. I've tried resetting the PRAM, but I do not have the sound of the double ring that I was expecting.

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Once a Mac is longer than 4 years, his PRAM Battery should replace before resetting the PRAM actually works.

Is this USB Flash drive "slipstreamed.  It works on any other older than 10.10.5 Mac?

What is a copy from another Mac or Mac Mini itself 10.10.5 clone?

Plug you directly into the USB port of the Mac Mini, or using a hub which is powered wall?

Tags: Mac

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