HP Envy laptop screen doesn't turn on

[Foxtrotter]

Hi, My HP Envy 15-as133cl laptop's screen doesn't turn on & is unresponsive. The charger light is on when I connect the external charger. The power light on the laptop also turns on when I turn on the power button. But the screen is unresponsive. I tried doing a hard reset (disconnecting both the main battery & the CR2032 CMOS battery, and holding the power down button) multiple times, but still doesn't work. I also tried disconnecting the main battery & using direct power from the charger. Still didn't work. None of the keyboard lights turn on either. The hard drive is working and I was able to disconnect the hard drive and transfer some important data. I also tried connecting to an external display without any luck. Any suggestions on what else I can do to debug this issue? Thanks!

[WAWood]

@Foxtrotter 

To determine the cause with hardware failures, you have to be able run diagnostics. We have no way of accessing your PC from here, so we can not do that for you. You have to do it yourself.

You do this by pressing the Esc key repeatedly when rebooting and then, when the HP Startup Menu appears, selecting Diagnostics (usually F2) and letting it run.

If it is NOT possible to run diagnostics, or if that does not work, then there is NOTHING more you can do by yourself -- and there is NOTHING we can do.

You will need to have the PC physically examined in a service facility by folks that can run their own diagnostics to determine what is wrong with it.

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If your PC is still under the original one-year HP warranty, or if you have purchased an extended warranty from HP and this is still valid, then having HP do this is an inexpensive option for you. In that case, you should contact HP Customer Support to see about having it repaired or replaced under warranty.

To contact HP Support see the following link to create yourself a case number:

Step 1. Here is the link: https://support.hp.com/us-en/contact-hp
Step 2. Enter Product number or select to auto detect
Step 3. Scroll down to "Still need help? Complete the form to select your contact options"
Step 4. Scroll down and click on: HP contact options
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If your PC is no longer under warranty, then it will cost you up front to have HP examine your PC. If you want to do that, you will have to contact an HP Repair or Service Center to see if they can examine the PC to determine the cause(s) of the problems, if it can be repaired, and an estimate of the repair costs.

Since you live in the U.S., here is a link to the HP Service Repair Centers:
https://www.service-center-locator.com/hp-hewlett-packard/hp-hewlett-packard-service-center.htm

If that link does not get you a useful page, then use the main HP link:
http://www8.hp.com/us/en/contact-hp/ww-contact-us.html

Good Luck