New iMac internet problem

[roeun]

I just bought a brand new iMac 21" last wed.
it's
2.9GHz
2.9GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache

and I added the fusion drive, with tax and everything it came a little over $2000.

and I'm having a BIG problem.
the internet connection is weird, to say the least.

It's not just slow. 90% of the time I open a browser I get "failed to open the server does not respond" type of message.

So far I have tried
wireless
ethernet connection
changing DNS numbers (that I found on google)
rebooting the modem
and tried using different browsers such as firefox and chrome.

I haven't tried any of the disk manager because it's a brand new computer.
is there anything else I can try to see what the problem is?
Internet itself cannot be a problem because I have a PC laptop and macbook pro that is just fine on wireless.

I just feel like I have a defective computer.

Please help.

[Serban]

You tried to reset all your network settings?

[glintoz]

How are other devices on the router going when connected to the Internet? OK or are thet also having problems? If they are having problems to it may not be your iMac

[roeun]

None of my other devices having problem.
My phone on wireless are much faster to use internet..

[djrod]

Originally Posted by roeun

I just bought a brand new iMac 21" last wed.
it's
2.9GHz
2.9GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache

and I added the fusion drive, with tax and everything it came a little over $2000.

and I'm having a BIG problem.
the internet connection is weird, to say the least.

It's not just slow. 90% of the time I open a browser I get "failed to open the server does not respond" type of message.

So far I have tried
wireless
ethernet connection
changing DNS numbers (that I found on google)
rebooting the modem
and tried using different browsers such as firefox and chrome.

I haven't tried any of the disk manager because it's a brand new computer.
is there anything else I can try to see what the problem is?
Internet itself cannot be a problem because I have a PC laptop and macbook pro that is just fine on wireless.

I just feel like I have a defective computer.

Please help.

I have a similar problem, my iMac loses the Internet connection( wired, not wifi) every now and then for a few seconds and I get the same message you said, but my iMac is 2009 one.

Maybe is a Mountain Lion bug?