I have Windows 7 (64 bit) installed. I mistakenly shut my computer down using the sleep button a week ago. When I press the start button on my computer, I can see/here the computer starting. I get several lights on steady on my keyboard but the mouse and the monitor never seem to work. I have tried to make things work by pulling the power cord on the computer, holding the start button on the computer until it shuts down, and pushing the reset button but nothing seems to work. As a further point, before this problem occurred, during previous starts, a white on black question came up on the monitor asking me whether I wanted Windows Vista or Windows 7--I have no idea why. I would appreciate any help to get me to where the computer works normally again. Thank you in advance.