Cannot connect iMac & MBP to router at same time (internet hangs)

Hi

Having a problem connecting the family's two Macs to our router at the same time. I've seen a few other threads that are similar, but none seem to be quite what's going on here....at least as far as I can tell.


I have a MacBook Pro 4,1 running 10.5.8 with Airport Extreme. I primarily use Firefox but also a lot of Safari.
My parents have an iMac 5,2 running 10.4.11 with Airport Extreme. They use Safari exclusively.

Whenever both computers try to connect wirelessly to the Belkin Wireless G router, the internet hangs on both. Can't open anything. No spinning beach ball of death. Things just don't open. After 3 or 4 minutes the "Cannot load this page" comes up (not the "You are not connected to the internet" message).

We've been having this problem for months (I bought them the router when I got my new MBP; this has been happening the whole time we've had them), but as I was only ever visiting for a few days, I just dealt with it & waited for them to go to bed before turning on my comp. Now that I'll be visiting for a few weeks, I'm trying to fix the problem.

Unplugging the modem & plugging it back in will get things working for a few minutes, but then we soon end up back at nothing loading.


Is this a router problem? Will a new/better router solve the problem?
I have the exact same one at school and my housemates & I beat the tar out of it regularly without any problems - four girls streaming video/music, downloading, etc, all at the same time. But here at home If my father & I try to check email at the same time, everything freezes.
Other computers connecting seems to not be a problem - my roommate had her laptop on her last visit and the two of us were able to get on together. But as soon as the iMac went on, everything stopped.

Or is it in the computers themselves? Is there anything to be done if they just can't play nice together?


Are we doomed to a summer of one computer at a time? Lol
I don't mind forking over the money for a better router if that's actually the problem. I also don't mind poking around my computer a bit but I don't know a lot so if you can give me steps I'd really appreciate it (though Terminal scares me, so if there's any way around using it, I'd appreciate those first)
If I can give any other info, just lmk. I'll be happy to. I just really want to be able to get online haha


Thanks so much!
Kate

 

Yes, everything is set to use DHCP.