when i turn on my laptop (vostro 1510). i hear 3 beep and in continue my display is off. But my windows come up and i hear "welcome voice" or other part of my laptop is work correctly. What is the problem?
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if there is no display showing at all you may want to reset the CMOS of your motherboard. to do this try undoing the ram panel from underneath the computer. make sure the computer is turned off and the battery unplugged. remove the ram, turn the computer on and you should hear some beeping. turn the computer back off, replace the ram and then turn it back on again, this should give you video output if the screen isn't faulty
no display after switching on the laptop? 1. try to connect to an external monitor using an analog video cable. monitor is on. turn on laptop after a minute press and hold on Fn key then press F8 at the same time to toggle the display between LCD to Monitor, if nothing happened do step 2. 2. turn of laptop. remove video cable. press and hold D key then press power button at the same time. this will test the LCD. check if there are colors display. if yes do step 3, if no replace lcd and lcd cable. 3. make sure laptop is off. press and hold on the Fn key then press power button at the same time to run a quick test. Even no display or anything wait for about 5 minutes check if you will hear series of beeps. If yes.replace video card if it is expansion, replace motherboard if it is integrated.