Currently Being ModeratedDec 3, 2012 9:25 AM (in response to Jonhewitt_uk)
You will have at least 3 months Apple Support with the purchase of your iMac and maybe longer if you purchased AppleCare. You can call AppleCare at no charge and talk the technical representative through your issue. They will know about the iMac and the Airport Express units and how to connect them properly.
Currently Being ModeratedDec 3, 2012 9:29 AM (in response to Jonhewitt_uk)
and when it 'reconnects' it is a completely random netork (ie not my IP address).
is the address 169.xxx.xxx.xxx?
it sounds like your express is set up incorrectly..... only one of your airport devices can act as a router, thus in control of giving out ip addresses.... the express should be in bridge/access point mode.....
only the main router should assign ip addresses
Currently Being ModeratedDec 4, 2012 1:53 AM (in response to alanoconnor)
Thanks for responses folks.
I have manged to reconnect my devices, although mot totally sure how! I think it has something to do with Alan's response as it seemed to work when I got the correct order of powering devices up, I think one of the airports hadn't been totally reset (although I held the pin in for a long time whilst orange light flashed!) and was still working in extender mode or still had it's own little network. I dunno, but all working now!