booting into system repair disk

Created a system repair disk for an HP Probook 450 G3 laptop (Windows 10)  how do I boot into it when I start the computer?
mkramer777Asked:
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JohnBusiness Consultant (Owner)Commented:
You may need to start in BIOS, turn Secure Boot OFF and the start with the recovery USB Key
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mkramer777Author Commented:
It's a DVD disk. How do I boot to the disk
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JohnBusiness Consultant (Owner)Commented:
When in BIOS change the boot order to start from DVD
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mkramer777Author Commented:
Is there a certain Function key on a HP Probook to get into BIOS?
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JohnBusiness Consultant (Owner)Commented:
Normally pressing F1 repeatedly at startup will start BIOS. Sometimes you can press Enter at startup to enter BIOS.
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ITSysTechSenior Systems AdministratorCommented:
Try F2 to get into the BIOS and F12 for choosing the boot options.
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nobusCommented:
HP uses F1 or F10  more info on bios :  https://support.hp.com/au-en/document/c00034791
for starting from DVD - use the Escape key during boot
see : https://support.hp.com/in-en/document/c03736054
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