How to disable HP Vectra VL400 Desktop chassis intrusion?

Hi all, i've had it with this....
A customer  has a HP Vectra VL 400 Desktop, every morning the intrusion alarm beeps and locks the computer, after she restarts the machine will boot with no problems.
I searched the BIOS and something called HP Top Tools, but still don't know how to disable it...
BTW i disconnected the cable from the chassis switch to the MB, but no effect.
Some help would be nice.

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Disconnecting the cable will certainly keep resetting the intrusion alarm.  Keep the cable on.
The reboot after the alarm has occured should unset the alarm for future.  If it keeps being set, whilst connected, then there may be a loose connection somewhere.  Maybe the switch is jammed out or something.  Have you tried reconnecting the cable and forcing the switch to remain closed even when the case is off?  I don't of any way to cancel the alarm completely!

bmquintasAuthor Commented:
Thanks rubiconx , i'll give it a try tomorrow (it's 11:20pm here), and i'll post the results.
BTW, already crossed that page at hp forums... after googling for 2 days...
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Instead of removing the cable, short it (a normal jumper may do the trick).

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bmquintasAuthor Commented:
Sorry, i haven't had time yet to test the last suggestion from rindi, (yes i get lazy at Christmas time!), as soon as i test it i'll post the result.
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