Wifi Imac problem

First sorry for my English, I'm using google translator.
I bought an Imac 21 "core i5, 8GB, everything works ok unless wifi. When scanning networks of my house so I only get one bar, but when I connect all the bars are full.
Once I'm connected to Internet speed is very slow, I can not or 1MB when my MacBook in the same position has 6MB. What happens? Have I looked at many forums and have tried many solutions but none works for me. Can there be a problem with the Airport card? My router is 54Mbps and 2.4 Ghz, perhaps buying a 5Ghz router and more powerful antenna may be the solution?
Please I need to find a solution.
Thanks

There is probably nothing wrong with your computer. I would recommend changing the DNS settings on your computer. Here is how to do it:
1. System preferences
2. Network
3. Click Advanced
4. Click DNS tab
5. Click + sign
6. Add 208.67.222.222
7. Click + sign
8. Add 208.67.220.220
9. Click OK.
10. Exit System Preferences
11. Try out your iMac and report what happened.
Regards,
Roger

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~~~~~~~~~~~~~~~~~~~~~~~
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~~~~~~~~~~~~~~~
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When I move my Macbook to the lounge room, 6 steps away, my internet stops working despite wifi bars remaining full. We also have an Apple TV in the lounge room (I have airplay disconnected on Macbook). 15% of the time, I can somehow get the internet to work in the lounge room (sometimes just by disconnecting airplay),then it mysteriously stops- with wifi bars remaining full.
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Most people who live in neighborhoods or apartments are not blessed with so few WiFi transmitters to contend with. There are no clear channels for most people, even assuming the user knows how to optimize their router, which most people don’t.
I would also explain that I am FCC licensed amateur radio operator K5ZN extra class. I know how radios work and how electromagnetic waves behave. Every diagnostic and symptom tells me there is some incompatibility between my MBPs radio and specifically the Comcast modem-router. In another discussion I gave some technical information about the problem which I spent several day diagnosing while using two different Comcast "Docsis 3" routers.
I have not seen this WiFi problem when using Airport or other standard routers like Linksys or Netgear. The OP didn’t say what router they are using. My suspicions tell me that Apple is moving in the direction of a very sensitive power-saving radio while ISPs are trying to blast the neighborhoods with powerful WiFi. The result is that my poor Macbook can’t get a good signal.

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I've just come onto these forums today, for the first time, largely prompted by a major iMac problem i've encountered over the last couple of days. Please excuse me if any answers to my problem have previously been posted, but i'm typing on a borrowed laptop, which I have use of for today only.
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don't have Apple Care, but I am still well within the one year standard warranty period.
Without AppleCare, you cannot get on-site / in-home repair.
Also, you will need to take the computer into your local shop for inspection / servicing.
With AppleCare, they will come to your home for diagnosis and repair.
If you were within your first 90-days, you would be able to call Apple to request phone service and possibly have them send the part to you for installation.
But, after the 90-days, they are not very inclined to talk to you on the phone. So, they send you to the local service center for inspection and repair.
One option is the online support system. You can chat with a tech online, and they can assign a case number to you, and send you to a website to order the replacement part.
I went through this chat method recently, and it seemed to work fine.
Go here:
http://www.apple.com/support/imac/
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One additional option, is to try the online wizard. It is on the same website, but has a link that says:
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This wizard allows you to browse through a navigational menu, and select the replacement part you need.
I had a sticky mouse button, so my problem wasn't in the menu. They had mouse related issues, but not my problem. So, I went through the online chat.
If you are able to find your symptom in the menu, then you might be able to order your part right there without chatting with a support agent.
Otherwise, try the support agent chat.
This might be more convenient than taking it in for inspection.
Hope this helps.

Wifi Imac problem

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