问题在于你硬盘的启动优先级高于光驱。
The problem is that your hard drive has a higher boot priority than your optical drive.
许多现代的BIOS包含了一个启动菜单，在这里你可以动态地修改设备的启动优先级。
Many modern BIOSes include a boot menu from where you can change the priority of your devices on the fly - try pressing the 'Escape' key or F12 when you first see something on the screen.
有时你可能需要更改设备的启动优先级以便能够从光驱启动一个live版的Linxu发行版。
Occasionally you will need to change the device boot priority to be able to boot a live Linux distro from your optical drive.
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