Installed Yosemite and worked fine now when turned on, locks up right away. Cant even update. Yosemite problem or hardware? Help please

Macbook Air locks up as soon as you click on anything when turned on. Can't update software, can't do anything. Help please

To rule out software probem, do the following: 
Run OS Recovery
Disconnect all devices from your computer.
Boot up from your computer by holding down the command+r keys.  This will take you to the recovery drive.
Select Disk Utility & hit Return. 
In Disk Utility select the HD on the left & click on Repair Disk (bottom right).
When you reach the desktop after doing the above, repair permissions & restart your computer.
To rule out hardware problem:
Run Apple Hardware Test.

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