System Preferences lock always unlocks itself after restart

From the menu bar, select

 ▹ System Preferences... ▹ Security & Privacy ▹ General

If there's a closed padlock icon in the lower left corner of the preference pane, click it and authenticate to unlock the settings. Enter your login password when prompted.

Click the Advanced button and check the box marked

Require an administrator password to access locked preferences

in the sheet that drops down. Then click OK.

Sorted, Thank you for this tip.

correct password for me results in sys prefs crashing leaves this...

Date/Time: 2014-05-27 04:16:24.758 -0700

OS Version: 10.4.11 (Build 8S165)

Report Version: 4

Command: System Preferences

Path: /Applications/System Preferences.app/Contents/MacOS/System Preferences

Parent: WindowServer [58]

Version: 3.3 (3.3)

Build Version: 20

Project Name: SystemPrefsApp

Source Version: 1260100

PID: 215

Thread: Unknown

Link (dyld) error:

Library not loaded: /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate

Referenced from: /System/Library/Frameworks/QuickTime.framework/QuickTime

Reason: no suitable image found. Did find:

/System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate: unknown required load command 0x8000001F

/System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate: unknown required load command 0x8000001F /System/Library/Frameworks/QuickTime.framework/QuickTime

Model: PowerMac7,3, BootROM 5.2.4f1, 2 processors, PowerPC G5 (3.1), 2.7 GHz, 8 GB

Graphics: NVIDIA GeForce 6800 Ultra DDL, GeForce 6800 Ultra, AGP, 256 MB

Memory Module: DIMM0/J11, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM1/J12, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM2/J13, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM3/J14, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM4/J41, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM5/J42, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM6/J43, 1 GB, DDR SDRAM, PC3200U-30330

Memory Module: DIMM7/J44, 1 GB, DDR SDRAM, PC3200U-30330

Network Service: Built-in Ethernet, Ethernet, en0

Serial ATA Device: Maxtor 6Y160M0, 152.67 GB

Parallel ATA Device: SONY DVD RW DW-Q28A, 7.83 GB

USB Device: Hub, Up to 480 Mb/sec, 500 mA

USB Device: Hub in Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 500 mA

USB Device: Apple Optical USB Mouse, Mitsumi Electric, Up to 1.5 Mb/sec, 100 mA

USB Device: Apple Pro Keyboard, Mitsumi Electric, Up to 12 Mb/sec, 250 mA

USB Device: Apple Cinema HD Display, Apple Computer, Inc., Up to 12 Mb/sec, 500 mA

FireWire Device: unknown_device, unknown_value, Up to 400 Mb/se