My macbook air was working fine until all of a sudden it froze.

I have a macbook air and everything was working fine until all of a sudden my computer froze.  I then rebooted my computer by press & hold down the power key because it would not allow me to open or close any programs.  After i rebooted it, the keyboard & touchpad won't work. i could'nt login to my computer because all the buttons on the keyboard seems to be not responding, only the power button is working.  i am also not able to move the arrow around. i think the touchpad too is not responding. really appreciate it if anyone would share any feedbacks.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled on some models, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output and  Wi-Fi on certain models. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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