Bash Script elif error. Syntax error near unexpected token 'elif' bash scripting

HI,

Im having problems with my bash script that I am using for automated zenwork imaging. I always get a elif error on line 23. Error message is Syntax error near unexpected token 'elif' bash scripting line 23. Can anyone please help.
Script is shown below.

mount dev/sda2 -t ext2 mnt/harddisk
Option=""
while [ "$Option" != "4" ]
do
echo ""
echo "THH Data Migration - Zen Imaging"
echo "--------------------------------"
echo "1            View ZEN Partition Info"
echo "                                "
echo "2             Take Backup Image of PC"
echo "                                "
echo "3             Restore WinXPBase      "
echo "                                "
echo "4        Back to Bash Prompt    "
echo "                                "
echo "5             Exit & Reboot          "
echo "--------------------------------"
echo "Please Enter Your Choice:"
read Option;
if [ "$Option" = "1" ]; then
      img dump geo
      echo "View Partition Info";
elif [ "$Option" = "2" ]; then
      ImageNAME=""
      while [ "$ImageNAME" = "" ]
      do
            echo "Please Enter Asset Number For Backup of Image: ";
            read ImageNAME;
      done
      PartNo=""
      while [ "$PartNo" = "" ]
      do
            echo "Please Enter Windows Partition No from Step 1: ";
            read PartNo;
      done
            if [ "$PartNo" = "1" ]; then
            img ml mnt/harddisk/PCBackups/$ImageNAME.zmg x2 x3 x4 x5 x6 x7 x8
            elif [ "$PartNo" = "4" ]; then
            img ml mnt/harddisk/PCBackups/$ImageNAME.zmg x1 x2 x3 x5 x6 x7 x8
            fi
elif [ "$Option" = "3" ]; then
      PartNo=""
      while [ "$PartNo" = "" ]
      do
            echo "Please Enter Windows Partition No from Step 1: ";
            read PartNo;
      done
      if [ "$PartNo" = "1" ]; then
      img rl mnt/harddisk/newwinxpbase.zmg a1:p1
      if hwinfo --bios | grep -i "D510"; then img rl mnt/harddisk/Driversets/d510.zmg a1:p1
      elif hwinfo --bios | grep -i "D530"; then img rl mnt/harddisk/Driversets/d530.zmg a1:p1
      elif hwinfo --bios | grep -i "D5000"; then img rl mnt/harddisk/Driversets/d530.zmg a1:p1
      elif hwinfo --bios | grep -i "D5100"; then img rl mnt/harddisk/Driversets/d530.zmg a1:p1
      elif hwinfo --bios | grep -i "dc7100"; then img rl mnt/harddisk/Driversets/dc7100.zmg a1:p1
      elif hwinfo --bios | grep -i "dc7600"; then img rl mnt/harddisk/Driversets/dc7600.zmg a1:p1
      elif hwinfo --bios | grep -i "dc7700"; then img rl mnt/harddisk/Driversets/dc7700.zmg a1:p1
      elif hwinfo --bios | grep -i "dc7800 "; then img rl mnt/harddisk/Driversets/dc7800.zmg a1:p1
      elif hwinfo --bios | grep -i "Ultra"; then img rl mnt/harddisk/Driversets/dc7800usd.zmg a1:p1
      fi
      if hwinfo --cpu | grep -i "Units/processor: 2"; then img rl mnt/harddisk/Driversets/multiCPU.zmg a1:p1;
      fi
      elif [ "$PartNo" = "4" ]; then
      img rl mnt/harddisk/newwinxpbase.zmg a1:p4
      if hwinfo --bios | grep -i "D510"; then img rl mnt/harddisk/Driversets/d510.zmg a1:p4
      elif hwinfo --bios | grep -i "D530"; then img rl mnt/harddisk/Driversets/d530.zmg a1:p4
      elif hwinfo --bios | grep -i "D5000"; then img rl mnt/harddisk/Driversets/d530.zmg a1:p4
      elif hwinfo --bios | grep -i "D5100"; then img rl mnt/harddisk/Driversets/d530.zmg a1:p4
      elif hwinfo --bios | grep -i "dc7100"; then img rl mnt/harddisk/Driversets/dc7100.zmg a1:p4
      elif hwinfo --bios | grep -i "dc7600"; then img rl mnt/harddisk/Driversets/dc7600.zmg a1:p4
      elif hwinfo --bios | grep -i "dc7700"; then img rl mnt/harddisk/Driversets/dc7700.zmg a1:p4
      elif hwinfo --bios | grep -i "dc7800 "; then img rl mnt/harddisk/Driversets/dc7800.zmg a1:p4
      elif hwinfo --bios | grep -i "Ultra"; then img rl mnt/harddisk/Driversets/dc7800usd.zmg a1:p4
      fi
      if hwinfo --cpu | grep -i "Units/processor: 2"; then img rl mnt/harddisk/Driversets/multiCPU.zmg a1:p4;
      fi
      else
      echo "Invalid Partition Number, Please contact Harps or Bal: ";
      fi
elif [ "$Option" = "5" ]; then
      reboot -f
fi
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