laptop display problem

[lmcmains]

The first thing I would do is do a System restore. Go to start menu, accessories, system tools then select system restore. Set it to a date you know it was working good.

[ddouglass]

If I remember correctly you need to have the second display on and hooked up before booting the laptop. I have seen that in here several times, though I don't use a laptop so have not experienced it.

I have however forgotten to turn on my mixer which switches my video and pulled my hair out trying to figure out why no display.

And have even had a bad cable because it got crushed too many times under a table leg, so you might try a different cable.