Hi, I have a Toshiba Satellite l455-s5009. It recently stopped loading the screen, but it won't display to an external monitor either. I then got a new mobo cpu and ram and put it in, and it still does the same thing. The lights turn for power, hdd, battery charge and the fan spins for a second when I press power and the dvdrom drive flashes and clicks. But no screen. I've tried it with both the original power supply and a universal one that is rated to work with it to no avail. Can someone help me cause I'm at my starting to get really frustrated.
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Are you getting any POST codes? Whether they're audio or visual (sometimes the caps lock light will blink in patterns on certain systems to indicate the POST error).
I figured out what was wrong, it was a bad inverter board near the screen. It was putting the laptop in a permanent stand by state
I don't see why the inverter would have anything to do with external output, as its job is to simply power the backlight on the built in screen.