Can't boot from USB or DVD. HP Pavilion g6-2257sr

My new notebook HP Pavilion g6-2257sr don't let me to boot from USB device. 
When notebook's booting, I pressed ESC and F10. Then I set up UFEI boot order - USB-device / DVD / OS selector. 
I use official Windows 7 disk, and several own USB devices with bootable images.
But rebboting use hard drive's OS all the same.
Please help. I want to delete current OS from my notebbok.
This question was solved.
View Solution.

Hi:
I would make a set of recovery disks first before proceeding.
To boot the PC you need to go into the BIOS and enable legacy mode.
Then you should be able to boot from another device.

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