Blank screen Envy 15 despite reset and external monitor

HP Envy 15 J112TX notebook has worked well for a week. Windows 8. The screen is black but can hear the fan going. Hard reset didn't help. External monitor didn't connect - it said to check the video connection. The cord was connected HDMI to DVI. Did another reset. Now i have switched it on and off a few times so that when i switch it on after a minute it will make asmall pop sound and then the fan stops making noise and it won't switch off despite holding dow the power button for a minute. 
I disabled the nvidia graphics card a few days ago to try and save on power as it also has an intel graphics card. But it worked fine for a couple of days after i did that. 

Hi @salsa7 ,
I understand that you cannot get your HP Envy 15-j112tx Notebook PC will not boot up for you. I will try my best to help you with this issue.
Here is a document for Blank Screen LED Error Codes that may help us determine what is causing this issue.
I hope this helps, please let me know how it goes.
Thank you and have a great day!
I worked on behalf of HP.

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