Go to the Product Support Link at the top of this page, enter in your model info, then go to the download tab. FIlter for your Operations System in the left drop down menu and Display in the right hand one. Download the latest display driver for your system and install it. This should correct the problem.
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If you don't bother to post your COMPLETE model number it's very difficult to assist you. Please post in complete sentences with punctuation, capitals, and correct spelling. Toshiba does NOT provide any direct support in these forums. All support is User to User in their spare time.
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