My Toshiba will power up, all lights come on, fan runs, no a/C bartery to remove, but the screen stays black

also with the laptop off and battery removed check to see that your ram is locked into the ram slots. if not check to see if the power plug port on the laptop is lose. also look at the power plug make sure if there rubber o-rings to keep it from shorting out there still there. if the ac brink wire is twisted or looks broken see if someone has a working brick to try.
 
Try this...

1. Turn the laptop off (not sleep or hibernate but off).
2. Connect an external monitor to the laptop.
3. Turn on the external monitor.
4. Turn on the laptop.

NOTE: You may have to press an "external monitor" button. Could be the f4 button or a button with two monitors on it, for the external monitor to work.

If you can see fine on the external monitor, then your attached display, or the ribbon cable that connects it, are your problem.

If you can't see on the external monitor at all, or the problem occurs on the external monitor as well, then it is probably the graphics card/GPU that is the problem, which may require the motherboard be replaced.
 
also with the laptop off and battery removed check to see that your ram is locked into the ram slots. if not check to see if the power plug port on the laptop is lose. also look at the power plug make sure if there rubber o-rings to keep it from shorting out there still there. if the ac brink wire is twisted or looks broken see if someone has a working brick to try.
 
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