New iMac 27" - Airport Problems

My new 27" iMac arrived today! I can connect to my network via ethernet (as well as the internet). However as soon as I switch Airport on, the screen goes grey and asks me to reboot.
I have reinstalled OSX twice, and check permissions, also have up applied all the software updates available.
Can anyone help?
Thanks

HI and Welcome to Apple Discussions...
*"the screen goes grey and asks me to reboot"*
That called a kernel panic.
Try a different Airport channel.
Open AirPort Utility, located in the Utilities folder in the Applications folder on a computer using Mac OS X.
Select the device you’re setting up, and then click Manual Setup. Enter the base station password if necessary
Click AirPort in the toolbar, and then click Wireless.
Choose a new channel from the Channel pop-up menu.
Try deleting this file.
com.apple.airport.preferences.plist
MacintoshHD/Library/Preferences/System Configuration.
Move that file to the Trash and restart your Mac.
Try restarting with only necessary externals, ie; mouse and keyboard.
Check to make sure your ethernet cable is connecting properly. If you are using a cable modem, disconnect it from the power source for 20 seconds and reconnect. Sometimes that helps.
If you are using a router, check the vendor site to make it's 10.6 compatible.
More help here. Resolving Kernel Panics - X Lab
Carolyn

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hello everybody
just to inform, as here apple ssupport didn't ptopose such "simple`" solution to a kind of network misconfiguration , bad access to web services, aso
1) after a few s=days, a brand new imac 2.5 g intel core i5 was not connecting to te router correctly.
2) when calling apple support, describing the airport icon showing @no airport card connected@,(even if the system info[locations showed a card and even the modem data on screen..) so i had to pack tje machine and travel to such apple center downtown, Polanco, and here in Mexico it's a real pleasure to ride some 2 hours in eavy traffic..
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4) a few days later, again, no access to web, automatic or personalized network or account adjustments seem fine.. but no way to receive or send mail, web pages crazyly slow, aso...
5) when 24 hours later no way to see nothing, even the airport icon with stripes shows just clear empty grayish icon..
6) calling again ther apple service center, again they ask me to carry the stuff downtown, must be or could be probably a configuration problem, need to be checked there, aso, no way to look for or propose some solution just by calling them aso.
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Looks like this issue has hit its fair share of people. Spoke to Apple support today about the same issue. Brand new iMac 27' 2.8 quad core with 8gb of ram and I opened the box only to find my airport card was not recognized by OSX. After performing several support steps, the staff let me know that this was indeed a hardware related issue - I am not advocating this is everyone'e issue just mine.
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I have a brand new iMac 21.5". The first time I used it, it said there was no Airport installed. I phoned apple support and they told me to flash the pram. After that it found the Airport card.
Now it has lost it again and flashing the pram does nothing. This is very dissappointng - its BRAND NEW I haven't changed anything. Looks like I might have to return it....
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OK - this is early days, but this fix touch wood appears to have worked (after spending hours on the phone to Apple Support (who in fairness were very helpful)).
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