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Grub loader hangs with blank screen

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http://forums.fedoraforum.org – I installed fedora 12 to a 4GB flash usb flash drive. When I reboot and select windowsxp, grub displays a blank screen and hangs up. [root@localhost Terry]# fdisk -l Disk /dev/sda: 160.0 GB, 160000000000 bytes 255 heads, 63 sectors/track, 19452 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x41ab2316 Device Boot Start End Blocks Id System /dev/sda1 1 5 40131 de Dell Utility /dev/sda2 * 6 19054 153011092+ 7 HPFS/NTFS /dev/sda3 19055 19452 3196935 db CP/M / CTOS / ... Disk /dev/sdb: 4002 MB, 4002910208 bytes 255 heads, 63 sectors/track, 486 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x0e2b5cba Device Boot Start End Blocks Id System /dev/sdb1 * 1 287 2305296 83 Linux /dev/sdb2 288 486 1598467+ 83 Linux Disk /dev/sdc: 163.9 GB, 163927556096 bytes 255 heads, 63 sectors/track, 19929 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0xbf269802 Device Boot Start End Blocks Id System /dev/sdc1 * 1 26 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/sdc2 27 8456 67713975 83 Linux /dev/sdc3 8457 19929 92155904 8e Linux LVM [root@localhost Terry]# [root@localhost Terry]# cat /boot/grub/grub.conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You do not have a /boot partition. This means that # all kernel and initrd paths are relative to /, eg. # root (hd0,0) # kernel /boot/vmlinuz-version ro root=/dev/sdb1 # initrd /boot/initrd-[generic-]version.img #boot=/dev/sdb default=0 timeout=5 splashimage=(hd0,0)/boot/grub/splash.xpm.gz hiddenmenu title Fedora (2.6.31.5-127.fc12.i686) root (hd0,0) kernel /boot/vmlinuz-2.6.31.5-127.fc12.i686 ro root=UUID=2b0ee4e9-b9c5-4a08-9225-6b6f4e3649f3 noiswmd LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet initrd /boot/initramfs-2.6.31.5-127.fc12.i686.img title WindowsXP rootnoverify (hd1,1) chainloader +1 [root@localhost Terry]# When I change rootnoverify (hd1,1) to (hd0,1), I get error 13: Invalid or unsupported executible format. :confused: (HowTos)