My Samsung Galaxy SII X tries to load when I press the power button but stops and the screen goes black and it is also pulsing continuously. Removed the battery and tried to turn on again but it keeps doing the same thing.
How long have you had this phone? Does it still have a warranty?
If it still doesn't work after suggestions above. You can bring your phone to the nearest Koodo kiosk, and ask them if they can repair under warranty before you replace it.