Help: Can't start up in Safe Mode!

I'm trying to fire up in Safe Mode to do a few Spotlight housekeeping tasks but my Mac won't have it. When I try start up Safe it gets no further than the Grey Apple Logo and spinning wheel. After a short while the fans spin up to full speed and nothing else happens. I have to force the Mac to shut down and I can then start up again normally.
Any help on this would be much appreciated as there may come a time when I NEED to start up in Safe Mode.
Thanks in advance. Derek.

Hi-
Might want to try a Single User mode boot (command +s) and run fsck.
-Startup in Single User mode.
-At the command-line prompt, type */sbin/fsck -fy*. Press Return.
fsck will go through five "phases" and then return information about your disk's use and fragmentation. Once it finishes, it'll display this message if no issue is found:
The volume (nameofvolume) appears to be OK
-If fsck found issues and has altered, repaired, or fixed anything, it will display this message:
FILE SYSTEM WAS MODIFIED
Important: If this message appears, repeat the fsck command again, until fsck tells you that your volume appears to be OK (first-pass repairs may uncover additional issues, so this is a normal thing to do).
-When fsck reports that your volume is OK, type reboot at the prompt and then press Return.
-Your computer should start up normally and allow you to log in.
After this, try a Safe mode boot, again.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck

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      Model Name:          MacBook
      Model Identifier:          MacBook2,1
      Processor Name:          Intel Core 2 Duo
      Processor Speed:          2 GHz
      Number Of Processors:          1
      Total Number Of Cores:          2
      L2 Cache (per processor):          4 MB
      Memory:          1 GB
      Bus Speed:          667 MHz
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      Disk Sleep Timer (Minutes):          10
      Display Sleep Timer (Minutes):          10
      Automatic Restart On Power Loss:          No
      Wake On AC Change:          No
      Wake On Clamshell Open:          Yes
      Wake On LAN:          Yes
      Display Sleep Uses Dim:          Yes
      Battery Power:
      System Sleep Timer (Minutes):          5
      Disk Sleep Timer (Minutes):          10
      Display Sleep Timer (Minutes):          1
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      Display Sleep Uses Dim:          Yes
      Reduce Brightness:          Yes
    Battery Information:
      Battery Installed:          Yes
      First low level warning:          No
      Full Charge Capacity (mAh):          2745
      Remaining Capacity (mAh):          2745
      Amperage (mA):          133
      Voltage (mV):          12575
      Cycle Count:          507
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      Description:          AHCI Version 1.10 Supported
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      Queue Depth:          8
      Removable Media:          No
      Detachable Drive:          No
      BSD Name:          disk0
      OS9 Drivers:          No
      S.M.A.R.T. status:          Verified
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      Capacity:          111.47 GB
      Available:          24.09 GB
      Writable:          Yes
      File System:          Journaled HFS+
      BSD Name:          disk0s2
      Mount Point:          /
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      Capacity:          111.79 GB
      Model:          TOSHIBA MK1234GSX
      Revision:          AH008B
      Serial Number:          Z6M7T4FTT
      Native Command Queuing:          Yes
      Queue Depth:          8
      Removable Media:          No
      Detachable Drive:          No
      BSD Name:          disk0
      OS9 Drivers:          No
      S.M.A.R.T. status:          Verified
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      Capacity:          111.47 GB
      Available:          24.09 GB
      Writable:          Yes
      File System:          Journaled HFS+
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      Mount Point:          /
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      System Version:          Mac OS X 10.4.11 (8S2167)
      Kernel Version:          Darwin 8.11.1
      Boot Volume:          Macintosh HD
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    <Personal Information Edited by Host> 

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