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#11
Do you have the Lenovo ThinkVantage One-Key Recovery small button next to your Power Button? If so hold it down to access the BIOS, report back the Secure Boot, UEFI, CSM, or legacy BIOS settings choices which are available for your to choose.
You will boot the installation media using the same Recovery button. If it is not present you'd tap the F12 key at boot, unless you are entering via Windows 8 in which case you'd use Startup Options Menu - Boot to in Windows 8