Toshiba satellite pro l850 black screen fan runs two lights on front red and white,caps lock comes on that's all

You may have a bad main board or a faulty display adapter.

Some things you can try:

1. Connect an external monitor, if possible. If you get a picture, then the issue is with the internal screen or video cable.
2. Try new RAM, or test the laptop on one stick of existing RAM at a time, if available.
3. Reset BIOS and EC chip by removing the battery and power adapter, then remove the CMOS battery and leave out for 15 - 20 minutes. Put everything back and test again.
 
You may have a bad main board or a faulty display adapter.

Some things you can try:

1. Connect an external monitor, if possible. If you get a picture, then the issue is with the internal screen or video cable.
2. Try new RAM, or test the laptop on one stick of existing RAM at a time, if available.
3. Reset BIOS and EC chip by removing the battery and power adapter, then remove the CMOS battery and leave out for 15 - 20 minutes. Put everything back and test again.
 
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