asterisk users - Aug 2007 - Linksys 224P switch and Polycom PoE phones

Hi,
 
I'm in a bit of a bind here, and I'd appreciate anyone who can help me
quickly.  I have a customer who bought a Linksys 224P switch (PoE enabled,
with 24 ports).  He also has 4 Polycom 501 phones, PoE bundle.  Bizarrely,
the switch doesn't seem to power up the phone, even though all ports have
PoE enabled.