I am have a fully updated Arch Linux system that was running fine. Last night I tried to setup autofs per instructions on the Arch wiki, but upon restart there was no boot menu and only a GRUB error message saying Error 15.(1) Using Ext2explore in Windows, I can see the following partition structure:(2) Using fdisk in an ArchLinux live cd, I can see this:(3) I tried to do fdisk /dev/sda/ then the commands x, f, w to correct error, but fdisk says my partitions' ordering is correct already(4) Using the root and setup commands in the GRUB shell also ended in failure (it tells me it can't find GRUB files, /boot/grub/, etc. etc.). Specifically, I tried root (hd0,1), then setup (hd0), (also hd0,0, hd0,2, etc.), all failed.Is there any hope of restoring my system? Thanks for your help.P.S. here is my menu.lst, which can be seen in Ext2explore:# Config file for GRUB - The GNU GRand Unified Bootloader# /boot/grub/menu.lst# DEVICE NAME CONVERSIONS ##  Linux           Grub# -------------------------#  /dev/fd0        (fd0)#  /dev/sda        (hd0)#  /dev/sdb2       (hd1,1)#  /dev/sda3       (hd0,2)##  FRAMEBUFFER RESOLUTION SETTINGS#     +-------------------------------------------------+#          | 640x480    800x600    1024x768   1280x1024#      ----+--------------------------------------------#      256 | 0x301=769  0x303=771  0x305=773   0x307=775#      32K | 0x310=784  0x313=787  0x316=790   0x319=793#      64K | 0x311=785  0x314=788  0x317=791   0x31A=794#      16M | 0x312=786  0x315=789  0x318=792   0x31B=795#     +-------------------------------------------------+#  for more details and different resolutions see#  http://wiki.archlinux.org/index.php/GRUB#Framebuffer_Resolution # general configuration:timeout   5default   0color green black# boot sections follow# each is implicitly numbered from 0 in the order of appearance below## TIP: If you want a 1024x768 framebuffer, add vga=773 to your kernel line.##-*# (0) Arch Linuxtitle  Arch Linuxroot   (hd0,0)kernel /vmlinuz26 root=/dev/disk/by-uuid/f4c13c68-54e4-4631-8a5a-d1649d5c3b02 ro vga=771initrd /kernel26.img# (1) Arch Linuxtitle  Arch Linux Fallbackroot   (hd0,0)kernel /vmlinuz26 root=/dev/disk/by-uuid/f4c13c68-54e4-4631-8a5a-d1649d5c3b02 roinitrd /kernel26-fallback.img# (2) Windows#title Windows#rootnoverify (hd0,0)#makeactive#chainloader +1I tried the solution provided in the first answer, but failed with the following output:Also notice that menu.lst is not there, even though it appeared when I examined the partition in Ext2explore.Also, here are the contents of /etc/fstab:
GRUB error 15, no boot menu nor /boot
boot;arch linux;grub