my imac says wifi not configured all other devices in house are working please help

If the wireless card or circuitry in the iMac appears in the hardware profile, then it exists

and could be used by the system; the configuration of Network in system preferences is

part of that. Also the AirPort setup to be able to find & use available wireless networks

is usually not difficult.

•Configuring your Mac's network settings - macworld:

http://www.macworld.com/article/2027960/configuring-your-macs-network-settings.h tml

•Solutions for connecting to the Internet, setting up a small network, and troubleshooting - Apple Support

An older iMac running OS X 10.4 Tiger would be somewhat different, but similar to later:

•Network configuration for Mac OS X 10.4:

https://lapserv.maths.cam.ac.uk/docs/osx104.html

However, not knowing what iMac model build version or OS X system version your have

makes choosing how to reply to a general and vague question such as this. Since a Mac

does not run an iOS (an iDevice, not a Mac product, would use iOS system) what OS X

does your computer use? And if the hardware utilizes a core 2 duo or other Intel based

processor, then you don't have the vintage old iMac version this discussion area is about.

The answers change, depending on the hardware, since the later OS X versions do not

run on old hardware. So there is a gap between what you have, and what you said...

Even so, the general settings for Ethernet, Wi-Fi and other connections for networking

are in the system preferences; you can also choose to change options in there.

Good luck & happy computing! 🙂

Well, at some point the computer may have to be taken into an authorized Apple service provider

where an expert could run diagnostic testing intervals and perform troubleshooting by rote. That

means to resolve an issue through a process of elimination and escalation, as needed, to fix it.

With an AppleCare plan or complementary coverage plan on the computer, it should be taken

to the shop so someone can try the settings and check hardware vs software troubleshooting.

There may be a hardware cause of the problem, so most basic troubleshooting can be used to

separate possible software causes of symptoms from those hardware related ones. Then work

on a logical solution to the remaining factors. So the product specialist or expert may end up with

the computer in their shop for a time and hopefully it won't be a big learning curve for them, too.

The Intel-based iMac you have, has more integrated hardware than some previous models of Mac

computer, but no more than some portables. So if the computer has a warranty or AppleCare plan

to add extended coverage in effect (support & repair) then, they should have the unit in the shop.

Anyway, the answer probably is a matter of actually looking into the computer.

Could be a bad wire or something even more simple. The resets such as SMC

and NVRAM to check & reset the software/hardware should've been done in a

process of elimination. Sometimes more than once, but knowledgeably.

Not knowing what the Apple trained person has suggested you try, and results of that, I cannot say

what method to try next; but off to an Apple Store genius appointment for basic testing & diagnostic

could be high on a short list. If there is a warranty in effect, they can choose how/where to get it fixed.

Sorry to not be of help in this matter...

Good luck & happy computing! 🙂