My iMac can discover WiFi but won't connect how do i fix this?

My iMac will discover WiFi connections, i type in the right password but it wont connect how do i fix this?

A lot of older iMacs only support the original Airport, and not Airport Extreme. PowerPC (PPC) iMacs that have extreme are limited to 802.11g, and can't do 802.11n. Those with the original airport only support 802.11b, and the insecure WPA/TKIP or WEP encryption, and are better served via ethernet to a WiFi ethernet bridge.
The airport card typically is not built-in. Verify with http://www.everymac.com/ what the status of your iMac was, and/or see this article:
http://support.apple.com/kb/HT2256
Intel iMacs that are Core2Duo can be upgraded to 802.11n with the 802.11n enabler. You'll have to contact the Apple Store online nearest you to determine if you can still download it, as it is not on their website.
To determine if you already have it, see this tip:
http://www.engadget.com/2007/01/30/apple-busts-out-1-99-802-11n-enabler/

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Turn WiFi off - restart the iPad - turn WiFi on again and then try to connect again. Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button. Try to join again.
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Hello there, Confused Apples.
The following Knowledge Base article offers some step-by-step instruction for changing the email for your Apple ID:
Change your Apple ID - Apple Support
Sign out of iCloud, the iTunes Store, App Store, FaceTime, Find My Friends, Find My iPhone, and iMessage on each device that uses your current Apple ID for these services.
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Additionally, this article is helpful with what to do, after you've changed your Apple ID:
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Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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