Verified answer

It could be two things....but without seeing it, I cannot tell you specifically which one it is. I will try and explain

My first guess is the display inverter, which controls the back light of the screen. When you turn your computer on and your screen illuminates, it is the inverter that controls the brightness and powers the lighting tubes in the screen (also called Cold Cathode Fluorescent Lamps, or CCFL). When an inverter is 'going' out, it will sometimes give horizontal lines on the screen that scroll downward, like a "waterfall effect". Another symptom is the LCD brightness will "flicker", not necessarily on and off, but bright to half-bright--sort of like a kid playing w/ a light dimmer. If the inverter is completely dead, you will see no backlight; however, if you hold a flashlight up to the screen, you can still see your Windows desktop and pictures.

Inverters can cost anywhere from $80-$120, depending on where you take it and how old the laptop is, and labor will run you $100-$120.

Keep in mind that the older the laptop does not always mean the cheaper the parts, and often times it's more expensive to fix a laptop that is 5 years old vs. one that is 2yrs old. If you are not under warranty, then you might want to get a quote from a few local reputable repair shops. I generally charge $80 for diagnosis if the problem is not immediately obvious, and roll that cost into the repair if they decide to get it repaired.

My second guess is that the LVDS cable needs to be replaced. The LVDS cable is the "video cable" that connects the LCD to the mainboard in the notebook. It's a very small ribbon cable and usually can be replaced quite easily, depending on the make/model. You can usually tell if the LVDS is "going out" if the picture is garbled and the picture has lines in it. If the cable is torn or not making any contact, you will usually get a blank screen (either all white or black).

HP's are pretty easy to fix so if your notebook is out of warranty, you are probably looking at $40-$60 for the cable, and $100-$120 for labor. Don't quote me on the prices because I don't know what model of HP you have, or how old it is. Again, the older the notebook does not always mean the cheaper the part.

I generally tell people that if the cost for repair exceeds 40% of the cost of a new notebook, they may want to consider purchasing a new one. I don't make any $$$ on this but it's the most honest answer I can give them. The most common component people need to get replaced is hard drives, which is a pretty easy fix, but when it comes to displays and mainboards (aka. logicboard, motherboard), the cost can go up real quick and often times it's prohibitively expensive. to fix.

Good luck!

GG

Its a hardware challenge do not initiate it again, its via overheating or there is a few short-circuiting contained in the lappy so that you would possibly want to dodge spoiling any hardware section ur computing device turns itself off... bypass to service at present and if u can do it on urself then merely sparkling each of the dirt from interior it or any hardware fault......yet i choose going to supplier... desire that permits

Sounds like your FL inverter is failing. Take it to an authorized repair facility.