Currently Being ModeratedJan 18, 2014 8:47 AM (in response to ArthurHMac)
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If the keychain password on your Mac is not being accepted, you may need to reset the keychain. This article has instructions that can help:
Resetting your keychain in Mac OS X
If you are using iCloud Keychain, see this article for help:
iCloud: Troubleshooting iCloud Keychain