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My screen just alternates between 4 horizontal quarters of red, blue, greena nd off-white, black, off-white and white. No hdmi cable is plugged in. Turning PC off and on makes no difference. The screen just reverts to the alternating modes of colour. Any ideas anyone?
As nobody seems to have an answer for you, perhaps you should call one of Sony's Service Partners local to you. If you are in the UK, there is a full list here: -
http://support.vaio.sony.eu/computing/vaio/contacts/asc.aspx?l=en_GB&m=VGC-LV1S