ENVY 17 black screen

I have ENVY 17 laptop that will not start.  The screen is black, although I hear the fan and hard drive.   No action display - no message installation, no logo.   I tried the following:

-connected to an external monitor to check that the monitor is not bad.

-give to each of the memory chips

-exit the scratched disks and tested separately - each

try-a the system reset by pressing the power button for 15 seconds

Nothing positive in all this.  It seems that the motherboard must replace.  Can I do this?

Thank you

DGP

dgplugge wrote:

If the disks are out and Ultimate Boot USB shows no sign of life, I can image that it is the motherboard. I have eliminated the monitor using an external monitor. I have eliminated the possibility of a defective memory chip trying to start with a single. Of course, these two circuits can be bad. The replacement of the motherboard can be done at home?

Looks like something on the ATV (maybe vga) is defective. If the vga works not just what external monitor will not work in all cases. My guess is a bad vga. The only thing you can do is to replace the ATV. How old is the lappy?

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