The default boot order settings for the computer are configured in the factory. The default boot order determines what the computer boots to first.
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UEFI boot order
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OS Boot Manager
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USB Diskette on Key/USB Hard Disk
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USB CD/DVD ROM Drive
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Network Adapter
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Legacy boot order
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OS Boot Manager
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Notebook Hard Drive
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USB Diskette on Key/USB Hard Disk
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USB CD/DVD ROM Drive
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USB Network Adapter
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Network adapter
To boot to a DVD, CD-ROM, USB device, there must be bootable files installed or the PC might bypass the device and load what is installed on the local PC.
An operating system not found error message may appear if a floppy disk or an optical disk is inserted into a computer that does not contain an operating system. If this error occurs, remove the disk and restart the computer.
If you have installed a second hard drive and the computer does not boot, select the hard drive which contains the operating system as first boot device in the hard drive group.