Okay, so about a month ago, my computer was running fine on Windows XP. But now when I try to boot it up, my monitor displays "Going into Sleep Mode", goes blank, and the power light turns yellow on it. This only happens when I plug it in the computer, as it is looking for the VGA output when its unplugged and the power light is blue. I turned off the computer and unplugged it from the main power source. Funny thing is, my monitor still displays, "Going into Sleep Mode" and the power light turns yellow every time I plug it in the computer, even when its COMPLETELY off. Also, when I turn my computer on, the fans and things are running, but my keyboard and mouse are off, as the keyboard doesn't light up when I press the Lock keys. Anyone know the problem?

My monitor is a HP vs17x and my computer is a HP Pavilion a1514n with a ATI Radeon Xpress 200 graphic card.

Thanks.