Mac book pro is not beinng switched one but screec back light (apple logo) is lighting and screen is also in dim light os x yosemite is not run

my mac book pro with retina display is not gtting log in prompt. back apple logo is glowing and screen also glowing in dim but i am get getting login prompt?
hy my mac book pro with retina display is not getting login prompt

Try booting into the Safe Mode using your normal account.  Disconnect all peripherals except those needed for the test. Shut down the computer and then power it back up after waiting 10 seconds. Immediately after hearing the startup chime, hold down the shift key and continue to hold it until the gray Apple icon and a progress bar appear and again when you log in. The boot up is significantly slower than normal. This will reset some caches, forces a directory check, and disables all startup and login items, among other things. When you reboot normally, the initial reboot may be slower than normal. If the system operates normally, there may be 3rd party applications which are causing a problem. Try deleting/disabling the third party applications after a restart by using the application un-installer. For each disable/delete, you will need to restart if you don’t do them all at once.
Safe Mode - About
Safe Mode - Yosemite
What does the screen show - anything?

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