T400 win Win7 ultimate display randomly blinks or goes dark

I have T400 with Win7 ultimate. When I boot normally the display may work fine from 1 min to several hours without a glitch before it starts to blink, flashing horizontal white lines or going completely dark. If I keep it on, occcasionaly the display may recover after 30-60 min and appears to be working fine.
When I boot in a safe mode, display works OK without such problems.
What is causing it and how can I fix it?
Thanks.

Hi
Thanks for the post.
As per your concern this issue might be occurs due to drivers or settings.
To diagnose, I would suggest you to please update the Graphics driver and Bios of your system from the below mentioned web link.
http://support.lenovo.com/en_US/downloads/default.page?
After this, please restart the system and check if the issue resolved.
Regards,
Sameer
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