I have a presario F700 and after using it for a while say half hour to a hour the screen goes to a different color back ground like a wall paper, its not a solid color it will have lines through it up and down or diagnally and it will be different color each time it does it and evenchually shuts down. The more I turn it back on and try to keep using it the faster it does it. Does this sound like its overheating?
This is definately an over heat issue. since laptops use on onboard graphics card, chances are you might need to replace the mother board, or may it may just need a fan replacement. also purchase a laptop cooling pad
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On most laptops it a simple case of pressing two buttons together, usually th 'FN' or 'Function' Key and 'F5' (press fn first, hold down then press f5) Yours maybe slightly different and use a different F key ie F3.
In this regard there is something happen on the video card cable underneath on the hinge of the laptop. I have also Presario laptop that has same issue that you encountered.If you can able to open the laptop's hinge to check the video cable connection then you can check on it by resetting the connnection though. If your not able to do so either to go in the computer shop or have to call HP/Compaq for assistance. Thank you.
You don't know if you can swap the LCD screens until you dismantle both screens and compare them side by side. The video and inverter connectors maybe different.
There are companies on the Internet that sell replacement LCD screens.
One of the ones I use is LCD Parts, use this link to their WEB site. www.lcdparts.net
The problem you describe can be caused by two different things. The two are not related to each other in any way.
The first, which is more common on desktop computers than laptop computers, is a thermal problem. The video chipset is overheating and causing a shutdown of the video. It is possible that this overheating is actually the cpu, but I don't think so, based on your description.
The second is the video power inverter chip. The power needed to keep the lcd screen lit up on a laptop is considerably more than what is needed to run the laptop itself. For this reason, a small power inverter chip is installed on laptops. It is usually found under the plastic bezal that surrounds the screen, and usually on the bottom. When this chip goes bad, the symptoms are as you have described.
Here's a couple things you can do before seeing a technician or teaching yourself to take apart your laptop. Plug in a different monitor; an external monitor and restart your computer. You should have a function option that will let you see two monitors at once. (that's the fn key, usually in the lower left of your keyboard). With two monitors showing exactly the same pictures, see if you can recreate your symptom.
If the problem is in the power inverter chip, the external monitor should remain on when the lcd monitor goes black.
If the problem is inside your computer (video or cpu overheating) then both monitors will go off.
It may be the cable that attaches behind the screen is loose. If you type in your model# and "lcd replacement" in Google you will often find a tutorial on how to take it apart. Patience though our you will break something!