Hi,
At this piont of time, I am afraid to inform you that this could be because of a hardware failure., but we can try out some troubleshooting steps to resolve this.
Please perform the steps given in the weblink below:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00489814&cc=us&lc=en&dlc=en&product=439488
If the issue persists even after performing the steps, it means there is a hardware failure in the machine.
Get it serviced, if it is in warranty, contact Service Center.
I hope the best.
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