Im pissed up with my Compaq laptop  

I have never had a problem, like the one your talking about, I had a laptop and I got so tired of it, I got rid of it,because it kept turning off, because the battery would over heat, it was a dell laptop, and I brought me a desk top computer, which I know can get fixed my niece works on computers, I don't know what to tell you about the problem you having with your laptop.

My guess is that your laptop's LCD is giving up meaning it's already need replacement, I also had the same problem on my old compaq laptops which I already stop using because of the appearing lines and never bothered of sending it for repair because I decided on buying a new one since it's already that old.

Hey, I'm am also using a Compaq Presario and I also have had flickering problem before after a couple months of use. At first I tried to ignore it, but it worsened and got to a point that the screen would black out for several seconds, which can be really annoying. Good thing it was still under warranty so I was able to get a replacement and service parts for free.

According to a friend, when handling your laptop monitor, you should pull up or pull down from the center of the monitor. This way, the force is evenly distributed and protect your LCD from damage.

compaq is rather good product, but in some case we will get angry like me, i have problem with my wifi, but when i go to service center they manage a cost with very high price, after couple of day my friend check it, it is only unrecognized hardware problem, compaq service is bad =)

You seem to have a serious problem with your LCD. Either its connections are broken and getting wider or something (heat may be) is triggering the circuits of LCD.
Here's the deal you should take into account. Ask your sister to consult the store she bought that Compaq. Tell her to learn the possibilities of fixing it overseas. Global brands like Compaq, HP, Dell etc, offer worldwide guarantee, no matter where you are. But you must still be in the valid warranty period if your sister had extended it while purchasing. September 2008 seems at least more than one year old, which most of the brands offer max.
Compaq as far as I know offer only 1 year warranty (or guarantee) if you don't add lets say a 90 bucks more for extending it. However, they do have lifetime chat support for your product through their web site's support link. You can contact them and tell your story also. But!!! be prepared for spending a bunch of money to solve your problem. They will obviously replace your LCD and ask for a mere $200-$300 for it.
Good luck. Wish you could face this problem before that 1 year ended. Even 1 day is very important. Been there done that. One of my friend's Dell laptop had graphics card problem but when he asked me for help it was just 1 year and 2 days after his purchase. What a shame it was. He spent $130 to fix it for just missing the deadline for just 2 days.
Good luck to you.

That definitely sounds like a problem with your LCD screen. They are easy to replace, you can generally search for the make and model of your laptop and purchase a compatible LCD screen or you can check out the Compaq website directly. All said and done it's worth communicating with Compaq as regards this problem. Good luck. Andrew