LINUX boot system selection settings

LINUX boot system selection setting background: I have used a dual system: WIN8 + CentOS6.3. during the past few days, I have been unable to choose which system to use when I start the system, and I cannot use the keyboard, go to the default system. I think the Bootloader settings in MBR are incorrect! Go to/boot... LINUX boot system selection setting background: I have used a dual system: WIN8 + CentOS6.3. during the past few days, I have been unable to choose which system to use when I start the system, and I cannot use the keyboard, go to the default system. I think the Boot loader settings in MBR are incorrect! Go to/boot/grub. conf. the conf file is as follows: # grub. conf generated by anaconda # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a/boot partition. this means that # all kernel and initrd paths are relative to/boot/, eg. # root (hd0, 8) # kernel/vmlinuz-version ro root =/dev/sdb12 # initrd/initrd-[generic-] version. img # boot =/dev/sdbdefault = 1 # Here is the default system timeou T = 5 # wait for the selected time splashimage = (hd0, 8)/grub/splash.xpm.gz # it specifies the position of the screen image used during GRUB boot. Hiddenmenu # when this command is used, it does not display the GRUB menu interface and loads the default item after the timeout time expires. You can press the [Esc] Key to view the standard GRUB menu. Title CentOS (2.6.32-279. el6.x86 _ 64) root (hd0, 8) kernel/vmlinuz-2.6.32-279.el6.x86_64 ro root = UUID = c65c6ef7-ebc0-46f6-a83f-c599e3d6903b rd_NO_LUKS KEYBOARDTYPE = pc KEYTABLE = us rd_NO_MD crashkernel = 128 m lang = zh_CN.UTF-8 export rd_NO_DM rhgb quiet initrd/initramfs-2.6.32-279.el6.x86_64.imgtitle WIN8 rootnoverify (hd0, 1) chainloader + 1 # load the specified file as a chain loader. To obtain the file in the first sector of a specified partition, + 1 is used as the file name. Boot Process: CMOS: record various hardware parameters and embed the memory BIOS on the motherboard: a firmware written to the motherboard (firmware: write to a software program on the hardware), the first program actively executed by the system when the boot 1, the computer will actively execute BIOS, the BIOS will analyze which storage devices in the computer are available and find out the first device that can be started 2. MBR, primary boot partition, the primary boot partition in the first sector of the device that can be started, including the boot loader 3. boot loader: A software that can read the kernel file for execution 4. kernel File: Start the operating system function MBR: Only 446 bytes, there is a set of software on the MBR: Boot loader, its main task is: menu provided: users can choose different boot options, which is also an important feature of multi-boot to load the kernel file: directly point to the boot program section to start the operating system to transfer other loader