Sudden Motion Sensor not active

Hello,
My new MacBook's SMS is inactive:
    Machine Name: MacBook
    Machine Model: MacBook1,1
    CPU Type: Intel Core Duo
    Number Of Cores: 2
    CPU Speed: 2 GHz
    L2 Cache (shared): 2 MB
    Memory: 1.25 GB
    Bus Speed: 667 MHz
    Boot ROM Version: MB11.005F.B00
    SMC Version: 1.4f8
    Sudden Motion Sensor:
            State: Disabled
But pmset says:
    $ sudo pmset -g
        Active Profiles:
        Battery Power -1*
        AC Power -1
        Currently in use:
         sms 1
         hibernatefile /var/vm/sleepimage
         acwake 0
         sleep 10
         autorestart 0
         halfdim 1
         hibernatemode 3
         disksleep 10
         displaysleep 3
         lidwake 1
         lessbright 1
I resetted the PMU and the PRAM but the SMS remains inactive.
Is it a hardware problem or a software one?
Thanks,
Gilles.
MacBook   Mac OS X (10.4.6)  

Have you notice whether or not the motion sensor
works?
Apparently not (tested with iAlertU for example and with the software from http://www.kernelthread.com/software/ams/ams.html).
Yeah I'd probably take juhs10's advice and give Apple
a call if it's not working. It's a strange
occurrence. I would assume it's a software problem
but I'm not familiar enough with it to say for sure.
Thank you, I'll call Apple tomorrow to see with them.
Thank you for your help,
Gilles.

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