Networked computer will not join network automatically after restart/sleep

Situation:
I've got two computers - PowerBook 17" 1,25 GHz, iMac 2,16 GHz 24", both running OS X 10.4.8. They are networked via AirPort Express, firmware v. 6.3, in a WPA protected network. The AirPort distributes ADSL 4 Mbps connection.
Computers are set as DHCP with manual address (to keep stable LAN address)
The problem: While the PowerBook always joins the network after restart/sleep automatically, iMac in such a situation never goes online - the airport status in menu bar is on, the network is checked, but it cannot connect or be reached.
I always have to manually turn airport of from menu bar, then turn it on, then wait about 20 seconds and then manually choose name of my network.
After this procedure iMac is finally online.
Settings of the AirPort are:
AirPort tab
Wireless Security: WPA2 personal
Channel: Automatic
Mode: 802/11 g/b
Internet tab
Connecting using: Ethernet
Configure: Using DHCP
WAN ethernet port: Automatic
Network tab
Distribute IP address unchecked (no difference when checked - tested)
Any idea how to fix it?
Thanks in advance!
PowerBook 1,25 17", iMac 24"   Mac OS X (10.4.8)  

Thanks a bunch, Duane!
You pointed me to the exact answer.
iMac joins the network automatically now, although I had to change original automatic login of an admin user to manual login page, because after automatic login as one of three users, an error message "Network error" appeared quicker than the actual joining the network, that came a few seconds later.
After manual logging (it probably needed a little more time) it's OK.
Thanks again and greeting from Czech Republic!
PowerBook 1,25 17", iMac 24"   Mac OS X (10.4.8)  

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