Power button not shuting down debian

[Neil Dugan <debian@butterflystitches.com.au>]

Hi I have an old compaq computer, when it had Fedora on it I could do a 
short press of the power button, and the computer would shut-down nicely.

I have since upgraded to Debian, the problem is that pressing the power 
button no longer shuts the computer down.

Any help in this would be appreciated.

Regards Neil.