I have the same problem with the same model. I have checked everything, and found the video is integrated into the motherboard. This does mean that the motherboard needs replaced, but I have not been able to find a motherboard that will work.
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If you don't use an identical monitors, then they may not work if your video card can not handle them. The "check video cable" it means the monitor does not get a signal, and it does not mean that the monitor is a problematic monitor. You can test this monitor as a single monitor (and try to connect it using first video port, and then move it to the second video port).
If it is still under warantee, take it back.. It has too many (different) hardware problems to warrant paying for service. replacement hardware would cost more than a new machine. Save your hard drives for the data and purchase a newer model.
Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp.
It may be that the display output toggle has been set to "external monitor" ... try Fn+F3 .... to toggle it from your screen, to external monitor to both ... and see if the screen works.
If this doesn't work, connect an external monitor to your computer, and toggle it, to see if the monitor displays the screen contents. If this works, then it's possible that your LCD screen is faulty ("fried")
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it does not sound like inverter has failed because you are using the correct method to switch screens, if the hard drive indicator is flashing/blinking that seems ok too. latops are supposed to beep when there is hardware failure to give us engineers an idea of the problem, you haven't mentioned that, but i know there is hardware by the description. start by taking the ram out, this could be faulty or disslodged and the machine sounds like boot but no display, clean the contacts on the ram with a pencil eraser (they work best) and dust off the rubber with a dry clean cloth, make sure there is no build up of dust there the ram slots, if you have more than 1 ram module try them one at a time. see what happends
Take the post (power on self test) disconnect vga cable and connect power cable if monitor shows no signal check signal cable massage then monitor is ok fault is in cpu. open it and clean the dust
by vaccum cleaner you will get the display again