Mac Mini doesn't reconnect to wifi router

I have 2 mac minis - a mark I running Tiger, and a newer dual-core running Snow Leopard. They connect to my network wirelessly through the airport. I usually switch my Netgear router off at night for security, but when I switch it back on, the Tiger mini will reconnect to the network OK, however the SnowLeopard mini will not, and requires a reboot.
This strikes me as a bit odd. Is there something I can do to encourage my newer mini to reconnect automatically? I have it set up to "ask to join new networks and to connect to known networks", but it's clearly not doing this.

Have you tried just turning the AirPort off and on rather than going for a full reboot? I know that isn't exactly the solution you were after but it's a lot faster if it works.
On this particular occasion I'd say you're too paranoid and that you can safely leave the router on to no ill effect although it wouldn't be a bad idea to change to WPA2 as all your equipment should be capable of it at a guess.

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