Having problems with your HP Compaq Presario R4000 Notebook ?

Compaq Presario R4000 looses video and freezes after a while

\015 My Compaq Presario R4000 looses video and freezes after a while.\015\012This has been happening for some time now . I had stored for about a year\015\012because of time constraints.\015\012When I turn it on initially (after resting for a few days) it works great for about\015\012half an hour then looses video. When I turn off using the power button and\015\012turn on again the same thing happens but in less time. This continues until\015\012eentually nothing comes up when I turn it on.\015\012When video is lost, the hard drive and fans continue running but no\015\012response from keyboard from keyboard when I press caps/num lock.\015\012I don't see any signs of overheating, the base is at normal temperature.\015\012Nothing happens when I tilt the screen -don't believe its a short.\015

Answers :

The problem you describe can be caused by two different things. The two are not related to each other in any way.
\015\012The 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.
\015\012The 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.
\015\012Here'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.
\015\012If the problem is in the power inverter chip, the external monitor should remain on when the lcd monitor goes black.
\015\012If the problem is inside your computer (video or cpu overheating) then both monitors will go off.
\015\012good luck
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