not boot, black screen always, no bios access

[teddmf]

Please Help!

Laptop has always worked fine.  Updated the Bios to latest ver F.71 last month and has been fine. Decided to install mSata SSD cache to allow HDD to boot up faster. After that Windows did not boot properly, Windows automatic recovery tried but failed. Went into Bios F10 key, disabled secure boot, enabled Intel RST and enabled legacy support. Could now see Intel RST flash on screen at boot up for the mSata and HDD. Looked fine. (also Ctrl-I would display the drives).  Went back into Bios and re-enabled secure boot and disabled legacy support. Windows 10 still not bootiing up correctly automatic repair attempted failed. Chose on the Windows recovery screen "boot from usb/dvd device" and put in my dvd  HP recovery disk. The system did not boot from the recovery. Powered down the laptop. The screen is now always black (no video or test whatsoever on screen) and can not get into Bios with F10 key. 

Troubleshooting attempted:

Tried to boot computer after all these tasks.

removed mSata (left this out - not putting back in)

cleared RTC by removing the battery connection

Hard reset the computer

removed memory modules and tried swapping or using one

Bios recovery using usb flash

removed HDD ... now back in

removed WiFi card - now back in

removed laptop battery

other startup key presses , esc,  F1, f9, f11

Summary: power turns on, fan spins up and stops, black screen, WiFi LED on orange, no other leds on or flashing (ie no caps lock leds)

[teddmf]

From doing some research online, it seems like this be what I need to do for a fix, but I need instructions on how to do this. Please, can anyone help?

Create a bootable UEFI enabled USB drive with a GPT partition, using the Rufus software. 

The UEFI bios is not accessable with ESC key press. Nor the normal bios via F10. I think when I selected to boot from a dvd/usb in the middle of the Windows 10 being in recovery, that I locked myself out. Bios should be in default settings as I removed the RTC battery connection.

[Jeet_singh]

@teddmf,

Thanks for engaging in HP support Forums! This is a wonderful location to converse with the community, get assistance and find tips! I understand you are having issues with the computer no longer boots into Windows. Don't worry I'll be glad to help you with this.

Splendid effort and fabulous description of the issue before posting. Kudos to you on that score. You are a valued HP customer and it is paramount to assist you here. I take it as a privilege to share this platform with you.

As you have already mentioned in your post that you have tried all possible troubleshooting steps and unfortunately, you are not able to load into Bios, In this scenario, I would personally suggest this could be a possible hardware failure. I would recommend you contact our HP phone support so that they can go ahead and service your PC.

HP Technical Support can be reached by clicking on the following link: http://h22207.www2.hp.com/us-en/?openCLC=true

(1) Once the support page opens please select the country in which you're located. Next, enter your HP model number on the right.

(2) Next, choose the 'Contact Support' tab at the top and scroll down to the bottom of the 'HP Support- Contact' page to fill out the form provided with your contact information.

(3) Once completed click the 'Show Options' icon on the bottom right.

(4) Lastly, scroll down to the bottom of the page and select 'Get the phone number.' A case number and phone number will now populate for you.

If you have any troubles, let me know and I will do my best to help!

Hope this helps, for any further queries reply to the post and feel free to join us again

Feel free to post your query for any other assistance as well,

It's been a pleasure interacting with you and I hope you have a good day ahead.

If you wish to show appreciation for my efforts, mark my post as Accepted Solution.

And click on the Purple Thumbs up icon at the bottom of my comment.

Regards,

[teddmf]

I just found this other post and I am  betting this is my issue as well. Cpu has gone bad. 

https://h30434.www3.hp.com/t5/Notebook-Boot-and-Lockup/ENVY-17-Black-Screen-Just-Fan-No-Bios/td-p/29...

[Jeet_singh]

@teddmf,

Thank you for replying,

As suggested in the previous post, this looks like a possible hardware failure. I would recommend you contact our HP phone support so that they can go ahead and setup a service for your PC.

Please use the link from the previous post to contact our HP phone support. 

I hope this helps. Let me know if you need any further assistance. I'll be more than glad to help you.

Regards,

[teddmf]

So replaced the motherboard, reused cpu. All is working again. So somehow the mSata installed in my system caused the failure.  I do have 16GB of ram and now thinking possibly the additional power draw caused the hardware failure.

[Jeet_singh]

@teddmf,

Thank you for replying,

I'm glad to hear you found the solution you were looking for.

I would suggest you keep the computer under observation and check how it performs.

If you need any further assistance, please don't hesitate to reach out to us again.

I'll be more than glad to help you.

You've been great to work with and it has been a genuine pleasure interacting with you.
I hope both you and your product works great and remain healthy for a long time 😉 

To simply say thanks for my efforts to assist you, please click the "Thumbs Up" button to give me a Kudos.
And mark my post as Accepted Solution to help others find a similar solution as you have.

Take care now and do have a fabulous week ahead. 🙂
Regards,