I have a HP Pavilion dv9330us Notebook PC that is about 3 years old. Recently, the LCD display has developed a flicker when the laptop lid is moved. At times, a green-tinted shadow appears until a jiggle the lid to get it to go away. The problem seems to be getting worse. It appears a wire may be loose. I'm ready to take this thing apart!!!! Could the video card be loose????

SOURCE: hp Laptop screen flicker

I am sure that the issue is related to the cable that connects to the LCD Display or the LCD Backlight.
There should be some connection shortage because of which the LCD flickers few times as stated by dan231.
I Recommend you to get the Notebook examined as soon as possible before something really goes wrong...

SOURCE: dear sir, i have a hp pavilion dv9330us laptop in which lcd scree remanes blanck while connecting to crt it screen giuves the bios setup totaly horijontal and vertical cheeker lines with asci value di

it is a design/manufacturing flaw in the gpu
nvidia is being sued over this

SOURCE: hp Laptop screen flicker

Hi, i noticed that when I unplugged my HP the screen stopped flickering. I then re-plugged in the power, when to the Nvidia control settings, to PowerMizer, and changed 'ac outlet' to Maximum Power Saving.

Not the world's greatest solution, but hey, working laptop now.

Cheers,
Andy.

SOURCE: HP Pavilion dv6700 overheats & shuts down

I rebiold these things constantly and they are not that hard to keep clean. The first thing i do is remove the battery, remove all power and push the power button for 15 seconds to bleed off any stored power on the motherboard. I used compressed gas from a can that has been purified and sold ay office supply stores. Using short bursts, spray into one side of the laptop at a time starting with the ventilation grill and ducts as well as the cd tray. If you look at the cd door, there is a small black hole on the door, push a paperclip in that hole and will release the door so you can blow some air through the device to clean the dust out of it. Once you have blown all the dust, hair and debris out of it, start it up.

Now you may have to update the BIOS if you have not done so recently. HP updated most of the BIOS files for these models to make the fans run stronger and longer to help with cooling. The bottom line here is that this particular model is a lemon and the only true way to keep the processor from melting into glass is to attach a laptop cooler to that is powered off the usb port.

If you want to update the BIOS, go to the link below and put your full model number in the search box, then choose driver/software downloads. Look for the small drop down menu that asks what operating system you are using. Now choose BIOS from the list below and download the latest (newest) one. Once the download is complete, shut down all running programs and double click the downloaded program. This will start the BIOS installer. Make sure that both the battery is installed and you are on AC power when you flash the BIOS!!! Now, just follow the prompts i the program and flash the BIOS. Reboot when it is finished.