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You never said if it worked with external monitor. You also didn't say if you tried the [fn]+[Fx] key combination on the keyboard to try and switch displays.
But, if you look at the screen closely, at an extreme angle and can faintly see the graphics then that means the backlight has blown out. For the displays with LED backlighting it's usually just a wire or circuit to repair. For the screens with CCFL (fluorescent) lighting it's a simple matter of replacing the inverter board.
If screen and external monitor do not work then the issue lies with the video section of your laptop. The video chip is soldered onto mo bo and there is noway you can replace it if bad. Kiss your laptop sayonara, salvage the hard rive and memory and get yourself a new laptop that works. And avoid HP - their customer service is non existent after warranty runs out. They refer you to a forum or tell you to get another unit - an HP of course!
So basically your monitor's power supply system died. Nothing much a non-technician could do about it. Get it repaired, if under warranty, get a replacement before the coverage duration expires.
Hello sir, hi, it seems you have a problem with memory modules, you need to open up your PC/laptop, and locate the memory. remove the modules, and clean its terminals (you clean then using a pencil eraser, just simply erase the terminals, until the contacts become shiny), with a soft clean paint brush, clean the memory slots too, then replace the modules, close then test the unit. do this several times until the unit boots up. keep me posted.
take the bottom cover off and take out the cmos battery, i had the same problem turned out to be a power problem, check that all the cables for the screen are inserted, an maybe try it on an external monitor, if stil no output chances are its the motherboard,
Try to clean its memory card or reseat it. You can use clean soft eraser to clean its edge connector. Do this when you first disconnect battery, off, and no other power source is connected to your unit.
This is the first step, then if still nothing check your hard drive and cdrom reseat if needed.
Try connecting it to an external monitor.
When you do, as soon as you press the power button to turn on the laptop, close the laptop lid - as this forces the laptop to display on an external monitor.
If this works, then it means the laptop screen is bad.
If it doesn't, the most likely cause would be that the laptop video card went bad.
For a while, some older Dell laptops with high-end nVidia graphics cards tended to die suddenly.
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