4 port switch to 8 port 1GB, iMac loses ethernet cable

We are getting prepped for an upgrade from our 10MB internet service to 1GB fiber. We were trying to do the easy things first, but have run into an unexpected problem.
We use a 4 port switch to distribute our current DSL signal to several locations in the house (never with any problem.) To handle the additional speed and add extra spots, we bought and installed an 8 port 1GB switch in exactly the same location. Everything works as previously except my iMac.
For whatever reason (and I would LOVE to hear opinions on why) the Mac now says it does not see an ethernet cable (the same cable, of course) and I lose the internet. The only change is the switch itself.
Am I missing a requirement for changing settings on the Mac to deal with this switch? We have not changed the input speed, we are still on a 10MB DSL. We're stumped.
BTW, if I plug the 8 port switch in, and use a 1GB USB dongle with my current ethernet cable, the iMac works fine. And it still works with the 4 port switch. Definitely not a cable problem. Stumped. Many thanks for any and all ideas.

Thanks for both your replies. I read them earlier in the day, and been trying a few things out...
1st, I tried plugging the hub3 into lan4 on the peak switch, and the other 2 (sky and roku), along with my laptop for testing purposes into 1, 2 and 3, and all worked great!
Well... all wasnt so great, the connection was sporadic and intermittent, ping was low, and throughput was fast, but it was on and off. A speedtest.net would stall, web links sometimes took 2 or 3 clicks, and so on.
So what have I learnt? Well, the fact that it has an internet port (which I was wrongly trying to use before), means that it isnt a basic switch.
So today, I went and bought http://www.tp-link.dk/products/details/?model=TL-SF1005D. Plugged that in the same way, and everything works perfect!
So now, I have the router (downstairs), plugged into the hub3 (upstairs via existing ethernet run throuth the stairs), 3 ports plugged into 2 pc's and 1 youview box, the 4th into a powerline socket upstairs,, with the other powerline socket plugged in downstairs behind the TV, connecting to the tp-link switch socket 5, with the sky+HD and Roku XL plugged into 1 and 2 on the switch respectively, and after testing I now everything running lightening fast with HD on demand, and the world is good
So thanks for both your advice, i learnt a bit today.

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What is the make & model of your modem?
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Is it something specific about the Comcast modem/router that makes it so I have to plug an ethernet cable into it too (as opposed to just running an ethernet cable directly from my iMac to the Time Capsule, which is what I assumed was possible and was hoping to do)?
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is there a way that I can use the TC as an upstairs wifi extender and still do my Time Machine back-ups wirelessly?
Yes. When the TC connects to the Comcast modem/router using an Ethernet connection, you could use the wireless capability of the TC to create a wireless network with the same wireless network name and password as the Comcast network. Then, you will have the same network upstairs and downstairs with much greater range.
You will be able to backup to the TC using wireless....or, if you prefer a much faster connection....connect an Ethernet cable from your Mac to one of the LAN <--> ports on the TC.
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Generally using a vpn and linking it via the computer to another router is particularly messy.
You are much better buying a cheap router that will do vpn with 3rd party firmware. Most vpn services recommend this kind of setup. I think you will do much better following their recommendations. Simply connect the iMac behind the vpn router when you want access to material from US.
TC do not have built in vpn and are difficult to setup for anything more than most basic functions.
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Hello.
I feel like an idiot.
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