Network problems

Hi, my sister in law is having problems connecting to the wireless network on her mac (the self contained monitor one). She's able to connect to the network once, but then after a while it disconnects and unlike any other computer it doesn't reconnect automatically. My windows laptop is fine, as is my wife's, but the mac keeps disconnecting. Is it the router or her computer?

The router is a logitec LAN-WH300N, and she's running 10.6.8 if that's any help.

How many wireless devices does your router allow..

It sounds like you maxed out the router and have no other free space to connect the mac to wirelessly this happens because routers are only allowed a set number of concurrent connections.

But here is the big question i have to ask you.

1. Is it the white iMac (if it is you will need a different router because that model of iMac uses a wireless g card and won't stay connected on a wireless n router.

This may happen for browser as well. Did she tried another browser?