White stretched dsiplay and flicker on HP pavillion sleekbook 15-b142dx

Upper 1/3 of display is white and stretched out.
Then it flashes and complete display is stretched.
When connected to the HDMI port a remote display shows no problems.
Do I need a new display?
It started only when set at 60hz and worked for a few weeks at 50hz refresh rate.
Now it doesn't matter what resolution or refresh rate is selected.

Hi
Once unit is powered on keep tapping the F10 key and once unit loads to Bios check if the display appears the same if yes. Request you to call HP Technical support and get the part replaced. You may check the warranty status in the link given below.
http://h20566.www2.hp.com/portal/site/hpsc/public/​wc/home?ac.admitted=1412776955380.876444892.199480​...
Let us know how it goes!
"I work for HP."
****Click the (purple thumbs up icon in the lower right corner of a post) to say thanks****
****Please mark Accept As Solution if it solves your problem****
Regards
Manjunath

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