IMac 5k causing havoc with my wifi

OK, so this is strange. First of all I'm not a mac newbie. I've been using mac devices since the 80s. That being said, I don't know WHY everything works, I just love that Apple products Just Work, until now...
Ever since purchasing the new iMac 5K and updating my other two laptops to Yosemite my network has not worked. Several calls to apple support only resulted in this: Fix the network temporarily by unplugging the modem and unplugging the router and booting them both back up. My network runs for a an hour or two and then suddenly its down. And my 3 year old is screaming because Despicable Me is "Broken"
Things are just weird since the updates:
1) non apple products (and the new iMac 5k) still connect to wifi when my network is "down". my iPhone, iPad Mini, Apple TV, macbook pro retina, macbook air all refuse to connect to the network, requesting over and over again to input the correct password this time.... But my OnePlus One - android phone connects just fine. I borrowed a friends chromebook to test out and it connected seamlessly. And my xbox 360 seems to connect as well.
2) we discovered by accident that if we are in close proximity of the new iMac 5k (i assume close enough for Hand off or Airdrop) suddenly we are able to connect to the network. We are able to remain connected for some time even after we have moved away from the iMac but eventually we are kicked off (1-2 hours)
3) Most problems disappear when the iMac is turned off completely. The network does intermittently cut in and out for a minute or so at a time every few hours or so, usually right in the middle of Despicable Me
4) Turning off wifi on the iMac 5k and using ethernet does not seem to work either. several hours later the network went down.
for some background, my network consists of Cox Cable supplied Docsis 3.0 modem (combined with voice over IP telephone) connected to Apple Airport Extreme (new version). I have the older version Airport Extreme connected via Ethernet being used to extend the network.
I understand there is a beta update pending (10.10.2) that is supposed to address wifi issues but I wanted some input for my situation.
Anybody out there experience this or similar issues?

Please read the warranty paperwork that came w/your computer.
You have 14 days to return the computer w/no questions asked.
You have 90 days of FREE phone tech support on top of your standard 1 year warranty unless you also purchased AppleCare which gives you an additional 2 years of coverage plus FREE phone support.
Strongly suggest that you take FULL advantage of the above before it runs out. Let Apple deal w/the problems & your concerns. It's what you paid them to do.

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I have a slight feeling that the two WiFi bands are making the trouble as during the configuration of the TC sometime the last figure 6 and 7 pops up, and that has something two do with the two different 2,4 and 5 GHZ bands
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I am thinking of returning the TC if I don't make it work now, but how do I delete all the data that's on it?

I can deal with the last question first and easily.
I am thinking of returning the TC if I don't make it work now, but how do I delete all the data that's on it?
Open the airport utility .. go to the disk tab and select erase.
When you select erase you will get mulitiple options.
Quick removes the file table but does not delete the files,, it takes 2min or less.
A Zero out data is the secure way,, by writing 0 ie low level drive format.
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7 pass will take a week.. not recommended..
35 pass erase is ridiculous.. it would take a month.. put an ax through the TC. It is quick and better.
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The fact that it did work and has now failed might point to faulty unit.
The only way to tell is reset it properly to factory and start over.
Universal Factory Reset.. any model TC or AE.
Unplug your TC/AE from power or turn off at the power point.
Hold in reset. and power the TC/AE back on.. all without releasing reset and keep holding in for about 10sec. (this is often difficult without a 2nd person or a 3rd arm).
Release it when the status light flashes rapidly. If it doesn’t flash rapidly you have missed it and try again.
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Be Gentle! Feel the switch click on. It has a positive feel.. add no more pressure after that.
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No files are deleted on the hard disk in a TC.. No reset of the TC deletes files.. to do that you use erase from the airport utility.
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Remember to keep all names short, no spaces and pure alphanumeric.
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Message was edited by: WZZZ

IMac (early 2009) not connecting to wifi

Excuse my typing I'm on my iPad so there may be errors!
Day before yesterday my router dropped the signal. By morning it was back on all all devices (iPad, iPod, Xbox, my dads pc etc) were working fine, but now my iMac will to connect to the wifi. It's driving me Barmy! I've called the provider, there is no problem their end any more, and they know nothing about macs so couldn't help.
I have tried everything. I've renewed my dchp lease, I've restarted and reset the router, restarted my mac, unplugged everything, forgot my network, created a new location... I've been trawling the Internet on my iPad for hours at a time looking for a solution, but there is nothing. Every single problem I've encountered seems to have a different cause, or their computer is different etc.
I am very, very reluctant to mess with my system settings so please don't suggest I go in and edit system files because I'd mess it up!
I am using 10.7.5 and my iMac is early 2009 20". I am with virgin media and cannot connect via Ethernet due to where the modem is placed. Is nearby, but plugging it in would mean wires trailing across the top of the stairs which would be dangerous!
Cn anyone help? I tearing my hair out! Tank you!

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Step 1
Back up all data.
Triple-click the line below the line you're reading now to select it:
/Library/Preferences/SystemConfiguration
Right-click or control-click the highlighted line and select
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Go ▹ Go to Folder...
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Step 2
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IMac 5k causing havoc with my wifi

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