Computer screen went black after trying to adjust settings

Hello, I prior to upgrading to win8, I was using two screens with my b320.  After upgrading I could only use the main screen.  I was trying to adjust the settings to extend the view to the second monitor when...the main monitor b320 went black.  I know it is on in the background.  When I restart the screen flashed Lenovo...the window 8 emblem appears...then nothing, but the sound at startup.  I don't know what to do, since I can't SEE anything..can't adjust anything etc...any advise?

hi Sassygurl,
Welcome to the Lenovo Forums.
Your display might be switched to the Second Screen (external monitor).
Can you try to:
1. Press the Windows Key+P and press the Up Arrow 3 times then press Enter (check this thread)
2. Unplug the external monitor and change the screen source.to PC Screen
Link to picture
3. If same problem, try to boot into safe mode by prssing Shift+F8 (might require a few attempts as dicussed here)
Let me know your findings.
Cheers
Moderator note; pictureconverted to link
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