I have an Acer Aspire 4520. I recently replaced the LCD on it after pink lemonade was spilled on the LCD area. It worked great for about a half a year. Now it started to make lines across the screen and now when I turn it on, windows and everything boots up, but my monitor stays black. When I plug it into an external monitor, it shows up just fine. So I know that my motherboard and video card are okay. And I can also fully adjust my brightness, so I know my LCD inverter isn't bad. So I narrowed it down to a bad LCD cable, I ordered a new one of those and installed it. I turned it on.............and it still stayed black. So it's not a bad motherboard/video card, LCD inverter, LCD monitor, or LCD cable, what else could it possibly be?
No the LCD is not the problem, it works. The thing is I can't even see the BIOS screen or POST. I think it is that the lemonade has corroded my connections between the LCD and Video Card.
try starting in VGA mode from the boot options menu (press F8 a bunch of times before windows starts to load). If this works then its probably a video setting that needs to be corrected. Have you recently installed a new video card driver? if so it might need to be reinstalled or rolled back to the older one. you should be able to do all that from VGA mode.
If VGA mode does not work then it sounds like you need to replace the monitor again.
Check out this flow chart to help you narrow it down even more. http://www.daileyint.com/hmdpc/lcd.htm
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