Solved Why won't HP Envy 20 TouchSmart All-in-One Desktop boot up?

March 29, 2016 at 12:34:50
Specs: Windows 10
I've read the suggestions to resolve this, but there is no available connection for an external monitor on my system. I've read about allowing the CMOS to reset, but that will involve removing the cover, and working with the systems internal parts. Is this wise? What else can I try when all I get is a black screen?

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✔ Best Answer
March 30, 2016 at 13:14:54
Try temporarily disconnecting both the data cable & power cable to the HDD, then see if the system will POST.


#1
March 29, 2016 at 13:05:21
if this a laptop remove battery pack remove Ac power and hold down power button for 30 seconds.then put battery back in and plug in cord see if it will boot up after that sometimes this solves the problem also sometimes you have to do a couple of times to make it work.all your doing is removing the charge on the system board and this has been known to fix such issues.good luck

Davidw

message edited by Davidw


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#2
March 29, 2016 at 13:42:33
I'm guessing the problem began after upgrading to Win10? It seems to be a common problem with HP all-in-ones.

From what I've read in the HP forums, clearing CMOS should fix it but it must be done correctly. The 1st thing you should do is unplug the power supply from the computer, then press & hold the power button for at least 30 seconds as was mentioned above. After you've done that, remove the back from the monitor unit & locate the clear CMOS jumper. Here's a generic picture: https://viaembedded.github.io/docs/...

Remove the jumper from its "normal" position & then move it to the "reset" position. Wait a few seconds & then move it back again. Reassemble the unit, plug in the power & attempt to boot. If it's successful, immediately entire the BIOS to correct the date, time, & any other settings that may have changed. Make sure to save the settings before you exit.


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#3
March 29, 2016 at 14:00:29
Hi, Riider...I did pull and replace the CMOS battery, but didn't change the jumpers back and forth. I'll give that a try. I "inherited" this system from a family member who got a new machine. They upgraded this one to Win 10, and the problems began. I booted and ran it several times before this "no boot-black screen" issue occurred. I don't want to spend any $$$ on repair, so I'm willing to try almost anything myself. Thanks for the suggestions!

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#4
March 29, 2016 at 16:02:18
It's very important that the power adapter is unplugged from the computer (not just the wall outlet) & the system is discharged before moving the jumper. Without doing so, CMOS may not clear. And there's no reason to remove the battery...the jumper is there for a reason.

I also saw someone mention that they fixed the problem by powering up with the jumper removed. If the other method doesn't work, it certainly won't hurt anything to try.


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#5
March 30, 2016 at 06:54:20
I'll remove the wall plug AND the power cable from the machine before opening it up. That's what I did when I changed the CMOS battery. I'll change the jumpers, allow them to sit for say 30 seconds before moving them back. If that doesn't work, I'll try removing the jumpers completely. As you said, it couldn't hurt to try. :-) Thanks! I'll let you know the results. I hope to get to it today.

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#6
March 30, 2016 at 10:07:29
Tried resetting the CMOS without success. Moved jumpers to positions indicated...no joy. Tried removing jumpers and booting...again, no joy. Tried every conceivable combination of jumper positions...no joy. Fan operates, and Hard Disk light comes on for a few seconds as though the system was trying to access it, but then nothing. I tried using a USB keyboard but the HP would not even provide power to it. I'm wondering about a bootable CD that might allow me to access BIOS/POST at least. Since I can't boot the HP, I'll have to find a boot routine that I can download on another system, and burn it to a CD. Do you know of any such boot disk routines that don't require me access to the HP? If I can reach BIOS/POST, maybe I can figure out what's wrong...but a black screen is all I've got.

message edited by solidgranite


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#7
March 30, 2016 at 13:14:54
✔ Best Answer
Try temporarily disconnecting both the data cable & power cable to the HDD, then see if the system will POST.

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#8
March 31, 2016 at 07:52:19
I'll give that a try, but neither cable is "in sight". The HDD resides inside a metal frame/box, so I may have to do some dismantling to get to the HDD cables. I looked for them while inside the machine, just to see if they were loose or had fallen off, but couldn't see either the power or data cable. They may be hidden by the frame/box. I'll be super glad if its just a bad HDD connection. :-) Thanks for the suggestion! I'll let you know the results.

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#9
April 1, 2016 at 07:40:22
Removing the HDD was actually rather simple...one screw and the unit slipped out. I tried booting the system with it removed...no joy. I checked the connectors and they looked fine, made a snug fit to the HDD. I replaced the HDD and booted again...no joy. There are 2 set of pins next to the CMOS battery, and I've shunted every combination...no joy. I put the shunts back to the "normal" position, and left it alone, unplugged, overnight. I'll boot it this morning and see what happens.

My keyboard and mouse are wireless, so trying the Win and B keys at power up doesn't work. I tried a USB keyboard, but got no power to it. I'm at a loss for things to try... I'm sure there's a solution to this situation, but I haven't found it yet. Got any other suggestions? As I said, I'll try anything. :-)

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#10
April 6, 2016 at 07:57:14
I've tried everything suggested with no joy. There must be something that I'm not seeing or doing. I'll research the web for other possible solutions. I want to express my appreciation to those in this forum who have provided some very helpful advice. You have my sincere thanks!

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#11
July 18, 2016 at 05:11:24
wow someone else is going thru the same hell. Please tell me thee is an answer 2 this nightmare

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#12
August 17, 2016 at 05:29:12
Has anyone ever figured out what the heck to do with the ridiculous black screen at boot up? I'm having the same issue in my Hp envy 20 touch smart desktop. 😞
Is this thread talking about desktop or laptop? Thanks for any help. I do nott want to go out and spend a grand on a new computer if it turns out to be a simple fix.

Sidenote: my nephews were playing video games on it ( mine craft) for a full week at time of apparent "crash" and they do not know if they downloaded Windows 10 when all this happened. Siiiiiigh

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