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Likely a issue with the video card. If those dots appear as the laptop is first turning on then for sure it is hardware related. If the boot up sequence is fine but windows displays dots it is a software issue that can be resolved by updating the driver or booting into safe mode. If hardware please contact the manufacturer. -Ravi Shanghavi
Dual screen mode? You mean dual monitor mode? But anyways, the maximum resolution that you can obtain on your Pavilion dv6t is 1366x768 unless you attach an external monitor. Even then, only the external monitor can go above 1366x768 resolution. You're laptop screen will remain at 1366x768 max. Ericthecmh
I would hook your laptop up to an external monitor and set it for Dual Monitor mode. If you do not see any lines on the second monitor, the problem is not with your video card, and more than likely a problem with the screen. Since this is a hardware issue, the best option is to take it in for a diagnostics from a local repair shop, if the system is out of warranty.
One last thing to try just to be sure it is not a software issue...down load the video card driver from HP.com and reinstall it. This is free to try so it is worth a shot, however I do think the issue is hardware related.
2.Press the wireless button. (The wireless light is turned on.)
3.Right-click the Wireless Assistant icon (select models only) in the notification area (lower-right corner of the screen), and then select the Open Wireless Assistant window. Select the appropriate settings to toggle on/off the integrated 802.11 and Bluetooth devices.
for more information you can also check the user manual on the manufacturer website.
Connect an external monitor to your laptop. If the problem appears only on the display of the laptop and not on the external monitor in the same time that means the video card is ok and the problem could be : the screen of the laptop or the invertor or the cable that attaches the screen to the mptherboard. If the problem appears on both screens, external and laptop, most probably the video card/motherboard is defective.
Have it checked/repaired by a professional.
Interesting that you counted them! If you haven't tried to reinstall the video drivers, do that. If that doesn't work, hook up an external monitor to see if the display is OK on that. If it is, then your LCD screen has a problem and will need to be replaced.