my problem is solved now, I needed to unplug the power to the modem and plug it in again. Apparently it was locked to my PC's MAC address and didn't accept the MAC address of the PIX when I connected it.
More exactly I am using a pix 501, SURFboard SB3100, the right cable but it still don't work.
pixfirewall(config)# ip address outside dhcp setroute retry 6
............................
DHCP command failed
ping outside does not work either.
pixfirewall(config)# sh interface ethernet0...
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