I Have just downloaded the latest upgrade and now my Mac Book Pro will not boot up !! how can I get out of this ?, I Have just downloaded the latest upgrade and now my Mac Book Pro will not boot up !! how can I get out of this ?

I Have just downloaded the latest upgrade (through software update) and now my Mac Book Pro will not boot up !! how can I get out of this ?,

Try starting in safe mode:
Ciao.

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