My macbook air 11 yosimite won't accept my password

I log-on in my account with my password, then I decided to change it. I went to system, user&groups then change password but my old password won't accept it so I decide not to change it anymore but from now and then everytime I log in to my mac, it won't accept my password, and I am very sure I did not change my password on the first time I tried it.

Hey Tim,
There's a pretty detailed article going over troubleshooting Wi-Fi issues like the one you're experiencing. I'd start off your troubleshooting by giving the steps in here a shot:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Have a good one,
Delgadoh

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I bought a second hand MacBook Air and it won't allow me to install updates as up pops the previous owners log in details. How do I go about amending this?

The seller was remiss in not properly preparing the Mac for sale. That task has now fallen to you. You will encounter continual problems until you perform the following. Ignore references to DVD since the MacBook Air has none.
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With a fourth finger press the power button to turn on the Mac.
Keep the other three fingers where they are until you see the "spinning globe" icon.
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Select the Mac's hard disk icon, then select the "Erase" tab.
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The fastest method is sufficient since all but the most expensive techniques and equipment will be able to recover securely erased data.
When it finishes, quit Disk Utility.
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When it finishes, shut down the computer.
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Thank you for the details of the issue you are experiencing with Keychain Access on your Mac. I found a couple of articles I suggest for the issue you described.
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Noble Seven wrote:
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== This happened ==
Not sure how often
== Today: Wednesday 28 July 2010

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boosterdoc wrote:
My email won't accept my password, was working fine, then one day it wasn't. It is almost as if someone else changed the password and now I cannot use my password or change it to a new one. My iMac is running 10.5.8 , using Earthlink and Safari. Any ideas on this problem?
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My macbook air 11 yosimite won't accept my password

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