I have a start up problem with my Acer TravelMate 2300.. When ever I turn it on, the screen shows acer logo or even goes until the log on window but doesn't allow me to log in. the screen lights are off and I could only read the words on screen by using my torch light. Pls help me to either log on or set the screen backlight on. This all happened after attempting to install window 7 window, the laptop had window xp proffetional before.