IMac is not detecting my home wifi

Hello everyone,
My home wifi have been working great for many many yrs. I have 3 iPads, 2 MBP, 1 iMac and 2 iPhones in this home and all are connected to my wifi with absolutely no problem.
Today I restarted my iMac and suddenly my iMac can no longer detect my wifi. When everything else at home is able with no problems. I have restarted the iMac a few times. Any ideas?
Joanne

So this is what is happening to my iphone.
Before iCloud, it has always been just mobileme or my iMac synching my contacts and I never had problems with it.
The iCloud came and we all have to agree its handy to have. But I noticed that everytime when I add a new contact to my iphone, iCloud gets the new contact but when I sync with my iMac, my iMac (Address Book) doesnt get that copy. I didn't know about this at all.
I usually do spring cleaning of my contact every few months and it is a lot easier to do on my desktop than on my iphone. So while I was going through my contacts on my desktop, I noticed some numbers were wrongly placed like, it is under "work" instead of "mobile" so I will get that corrected and also delete some contacts I no longer need. While doing this, I notice that some new numbers I added on my iphone wasnt on my address book in my desktop. Then I tried synching and noticed that whatever correction I did on my desktop wasn't going into my iphone as well. Thats when I realized that my iMac and my iphone's address book is no longer talking to each other. And when I look at my address book on my iphone properly, I am seeing that "unified contacts" and its combining all numbers and contacts. So under a friend's name, I would have 2 mobile numbers and 2 home numbers which are exactly the same respectively.
Hope that made sense.
I just want all these 3 locations, when I add or edit a contact, to be the same. Can this be done and if not, why the **** not? Why would they want to make them all different? Isn't Apple a lot better than this. This is the first time I see the eco system so badly turned out.
PS: should I have put all these in the other thread?
Joanne

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