My MB is always starting up in safe mode... why? What to do to start-up normally? Please help.

Question

Hi,
I am frequently having troubles with my MB. Different types of troubles. Couldn't solve a single one yet.
I have performed reboot MB in safe mode-- hold down the left shift key after the start up tone till the spinning gear appeared.
Few hours back i performed that, and since then it just starting up in safe mode without holding the any shift key. I have password protected log-in and each time the dialog box shown the safe mode, not the normal boot as it used to be. I restarted so many times, but same result.
I started-up by holding down the Option key, dialog box showing the same thing "safe mode" and same result.
I started-up in single user mode, and then typed reboot, then pressed enter/return button, but dialog box shown the same and it started up in safe mode after entering the password.
While in the safe mode, i have selected the Mac OS X 10.4.11 from the preference pane, then restarted, but all produced the same result, same dialog box showing the safe mode.
I couldn't take the screen shot of that dialog box that appears before starting up.
I am currently using the internet while in safe mode, and using ethernet adapter- a AirStream 1100 F25 external modem attached to the USB port. I don't know if that is good for my MB to use internet on the safe mode.
I used disk utility and verified the disk during the safe mode, i don't know if that is right or wrong to perform that utility in safe mode, but it all appeared as normal. You can see that from the following image.
Few days back, i performed the disk utility to verify disk while on the normal boot. But the result shown the red marks, please see the following image for details.
Hardware Overview:
  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
  Boot ROM Version:          MB21.00A5.B07
  SMC Version:          1.13f3
  Serial Number:          4*********M
  Sudden Motion Sensor:
  State:          Enabled
BANK 0/DIMM0:
  Size:          512 MB
  Type:          DDR2 SDRAM
  Speed:          667 MHz
  Status:          OK
BANK 1/DIMM1:
  Size:          512 MB
  Type:          DDR2 SDRAM
  Speed:          667 MHz
  Status:          OK
System Power Settings:
  AC Power:
  System Sleep Timer (Minutes):          10
  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
  Wake On AC Change:          No
  Wake On Clamshell Open:          Yes
  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
AC Charger Information:
  Connected:          Yes
  Charging:          No
Hardware Configuration:
  UPS Installed:          No
Intel ICH7-M AHCI:
  Vendor:          Intel
  Product:          ICH7-M AHCI
  Speed:          1.5 Gigabit
  Description:          AHCI Version 1.10 Supported
TOSHIBA MK1234GSX:
  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
  Volumes:
Macintosh HD:
  Capacity:          111.47 GB
  Available:          24.09 GB
  Writable:          Yes
  File System:          Journaled HFS+
  BSD Name:          disk0s2
  Mount Point:          /
TOSHIBA MK1234GSX:
  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
  Volumes:
Macintosh HD:
  Capacity:          111.47 GB
  Available:          24.09 GB
  Writable:          Yes
  File System:          Journaled HFS+
  BSD Name:          disk0s2
  Mount Point:          /
System Software Overview:
  System Version:          Mac OS X 10.4.11 (8S2167)
  Kernel Version:          Darwin 8.11.1
  Boot Volume:          Macintosh HD
Please help me out. Let me know how to start-up normally. By the way, my superdrive is not detecting DVDs including the OS dvds, but it read and write the CDs. So, It is not possible to reinstall OS early, at least not before the having the back up of the data. Please help me with contingency plan/s or as you think fit.
Thank you. Look forward to your reply.
<Personal Information Edited by Host> 

Answer 1

Maximillianmann,
depending upon how full “almost full” actually is, that could be the problem.
You can try this, if you have Mac OS X 10.7 or newer installed, to see if it’s not related to your disk being almost full: boot your MacBook Pro into Recovery mode by holding down a Command key and the R key as it starts up. Once the Mac OS X Utilities menu appears, select Disk Utility. On the left-hand side of the Disk Utility window, select your internal disk’s boot partition (typically called “Macintosh HD”). On the right-hand side, press the Verify Disk button if it’s not greyed out; if it is greyed out, or if it reports that errors were found, press the Repair Disk button. Once the verification/repair is completed, exit Disk Utility and select Restart from the Apple menu to restart in normal mode. Once you hear the startup chime, try booting into Safe mode; does it let you do so now?