I have an acer laptop running vista. the screen went bad.I removed the screen and starting using a stand alone monitor via vga. Everything was working fine until i accidentally unplugged the monitor and the vga stopped working.(have had this happen before and didn't have a problem plugging back in and continuing) Now i start the laptop and the screen shows its booting ok until the end of the Microsoft screen then it goes blank and says no signal. I can boot to safe mode and its fine. But reboot same no signal. any ideas???