Today I came home and tried to login to my pc, but XP just gave an error whenever I tried to type saying can not copy text from password field(or something of that sort). I shut down the pc, but instead of waiting for it to finish shutting down, I just did a hard shutdown. When I turned the pc back on, the drives started for a moment and then nothing. The screen is black and there are no error codes. When I press the power button the system repeats the process instead of shutting down. Any ideas how to fix this?