Safe Mode

whilst doing research on how upgrade operating system ( lion ) came across mention of booting safe mode. how 1 that? how 1 boot usb drive? have formatted 8gig usb drive , placed installer package on it. can’t imac boot it!

long time pc user , have migrated apple. new me!

in advance.

 

mac os x: starting in safe mode
make bootable mac os x 10.7 lion installer usb flash drive

 

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