Actually, last two days the displayt is not continous, after ten minutes it goes off, but the machine in running condition. But now, it is boot there is a long beep but there is dim light and nothing in screen. I check with external monitor, there is full of vertical lines in external monitor. where did the problem else in motherboard or displaypanel. What is the solution.
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Re: laptop display issue
On this model laptop, it is not uncommon for the video chipset to die. When it does, it is very much in the fashion you have described.
Unfortunately the solution is to replace the motherboard, as this video chipset is integrated into the board, not a separate card. You will need to either contact HP... $800ish dollars for a board, or look on Ebay for a new board for your laptop.
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The circumstances which you are narrating are quite clear that your display card is getting heated up during playing 3D games due to which your laptop is getting rebooted. Now you require to either put up a heat sink on your display card or get an external display card.
Remove the bottom pan to expose the cooling fan, clean all dirt out of the heat sink and fins,and clean fan, next remove the heat sink to expose the processor ic, remove the old thermal grease with rubbing alcohol, and apply fresh thermal conductive compound to the heat sink and processor, "not to much! just enough to cover the critical areas and assemble. In most cases this will solve the shutdown problem.
Turn on as you did before and leave on for 10 minutes. Then, try turning OFF the computer by keeoing the POWER button pressed for 7 secons. If the computer goes off, then your screen is fried and the computer is actually booting up normally... you just can't see it ;)
When you say screen goes very dark when it booted to windows so it means that when you turned on the laptop when the dell logo flashes the screen was fine? if thats the case could you please try this. after turning on the laptop you will see the dell logo flashes immediately keep tapping on F2 and then it will show you the BIOS setup utility, please check if in BIOS setup display goes dark as well. If yes then try this, after turning on the computer when dell logo flashes keep tapping on F12 to boot menu then select utility partition to run the diagnostics. Please run test on the LCD check if display goes black when running the LCD test. Then try this when you sees the dell logo keep tapping on F8 to boot in safe mode check if in safe mode display goes very dark. Try this too, boot in F8 then select last known good configuration check if the settings on your display will be fix. If you can boot to safe mode no problem then uninstall the display or video driver. then restart computer.
You can also try to connect an external monitor if you have one just try to isolate if issue is on the LCD or the video card. If the display is dark as well in external monitor then video card needs to be reseated if fails then replaced. In situation like this most video cards is integrated to the motherboards. So replace motherboard.