HP Pavilion DV6t 4650 laptop is a good choice of computing solution. When you have a video graphic card problem, one thing you should do is checking the BIOS. You can do this by turning on your laptop, and when it gets to display HP logo on screen, press F10 on your keyboard. This will allow you to go into the BIOS settings.

After you have checked the BIOS settings and not finding the problem, the problem might not come from hardware. It might because of software issue or laptop drivers.
Other workaround to find the video card problem is by performing a System Recovery in your system. Some symptoms DV6t 4650 users has is when they use System Recovery, they find drivers that are not correctly installed. This caused Out-of-the-Box-Experience (OOBE) setup of Windows Vista. This is a common problem when you asked the technician in the store to install Vista on the store when you bought the laptop.
Doing System Recovery when you have a problem on your laptop is a sure fire to find the culprit to resolve video card problem on your DV6t 4650 notebook.
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