Installation problem .... os x sierra

[sacha13]

Hello .
Here let me explain,
I have a problem I create my USB installation key bone X sierra.
When I boot ..... on my keychain to do the installation.
I'm the apple with the bar below progression /,
but installation instead of throwing my screen goes to sleep and nothing happens ......... I tried everything in every way available to install OSX and SIERRA ..... every time I have the same problem it will boot. not on the installation and my screen goes to sleep .... thank you for your explanations and your help?

 

[P1LGRIM]

Hello .
Here let me explain,
I have a problem I create my USB installation key bone X sierra.
When I boot ..... on my keychain to do the installation.
I'm the apple with the bar below progression /,
but installation instead of throwing my screen goes to sleep and nothing happens ......... I tried everything in every way available to install OSX and SIERRA ..... every time I have the same problem it will boot. not on the installation and my screen goes to sleep .... thank you for your explanations and your help?

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