MacBook pro can't start up, keyboard not responding. Help!

HI guys,

My MacBook would not startup after a forced shutdown in win7. When I started the machine as usual, hold down option key then choose win drive, it entered into a black screen and sticker there. I then shutdown the machine by holding the power button for several seconds. I thought is better get it started in OS and perform check the disk to see if there were any damage. I then started it without touching any key. It entered to the apple logo with a progress bar. The bar was progressing slowly. After 20min I realized that it stacked at aprox. 50%. I then shut it down and tried to enter disk utility. However, the hot keys not working! I tried all hot keys including hold option for start up disk choice. No matter what keys I hold, the machine enters into the white logo and progress bar screen. The keyboard is not responding.

I Then tried to use a usb external keyboard. it worked the first time when I hold the option key. I chose to stars up with the recovering disk and went away from my desk. When I return to it, the machine is on the white logo and progress bar screen again! Agin, I shut it down and restarted but the external keyboard wpuld not work!

Help please. What can I do to fix this problem?