Hp Allin One Computer Scree Os Black and White
#1 
BeigeBochs
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Posted 28 June 2019 - 08:52 PM
I was updating the UEFI on my HP Pavilion 23-g010 all-in-one desktop computer. It appeared to have succeeded; but when it restarted, it only gave a black screen. Now that is all it does when I try to turn the computer on: a black screen. There is no HDD activity, and keyboard num & caps locks don't respond; however, about five seconds after power-on, the power button can shut the computer off with a brief press rather than a four-second hold.
In my attempts at recovery, the following has failed:
- Logo(key) + B while holding power button for three seconds to turn on computer
- Logo + V while doing the same thing with the power button
- UEFI image file on USB thumb drive (USB thumb never even lights up)
- USB thumb drive while holding Logo + B or Logo + V and holding power button
If anyone knows of any other methods for initiating a UEFI recovery on this computer, I'd like to hear them.
Irrelevant details:
AMD E-series 1.3GHz CPU, 4 GB of RAM, 500GB HDD, Windows 8.1
Edited by hamluis, 30 June 2019 - 06:26 AM.
Moved from Internal Hardware to Backup/Imaging/Disk Mgmt, moved back to IH Hamluis.
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#2 Shplad
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Posted 29 June 2019 - 01:13 PM
Hmm...its sounds like it could be several things.
1. A failed UEFI flash update
2. CMOS defaults need to be reset/CMOS battery needs to be removed, left out for a few minutes and reinserted.
For #1, what method did you use to update the firmware? Did you flash within Windows, or within a BIOS/UEFI utility, or using some other method?
The text from this HP HOWTO
https://support.hp.com/ca-en/document/c02693833
is not the same as what you wrote. It reads:
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Press and hold the Windows key
and theB key at the same time, and then press and hold the power button for 2 to 3 seconds
Did you do that, precisely, because you wrote that you:
- Logo(key) + B while holding power button for three seconds to turn on computer
which is not exactly the same thing.
The difference is subtle but important.
Edited by Shplad, 29 June 2019 - 01:13 PM.
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#3 BeigeBochs
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Posted 29 June 2019 - 05:06 PM
The difference is subtle but important.
I worded it wrong, sorry. I held Logo and B on the keyboard (tried two different USB keyboards, actually) and then pressed and held the power button for three seconds, yes. And I continued holding Logo and B for up to a minute waiting for a response from the computer.
I also missed stating that I cleared the CMOS with the jumper inside the computer. I did not think of removing the CMOS battery and leaving it sit unpowered for several minutes; but that may be worth trying, even if the jumper method alone should have been enough.
As for the update method, I started HP's own UEFI update (or "BIOS update" as they put it) from within Windows. Then the system restarted, and a program (definitely not Windows; most likely an EFI binary) appeared on the screen reporting on the flashing process. Once the process finished and stated success, the system restarted again but did not show anything beyond a black screen.
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#4 Shplad
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Posted 29 June 2019 - 07:05 PM
Beige:
Okay, I'm more clear now. I don't want to make you feel any worse than you do, but in future, try to avoid firmware updates from within Windows. That method is the most risky, since layer upon layer of OS code is running. The safest bet is from within UEFI/BIOS, if that code is reliable, or failing that, from a bootable disc of some sort, using a minimal OS.
I would try removing the CMOS battery for 5 mins. and see how that goes. If that doesn't work, I'm not sure what to do next, as you might have a failed flash update. As you know, sometimes one can recover from that, sometimes one cannot and the computer is useless unless a new firmware chip is both available and just installed in a socket on the motherboard. In most cases nowadays, they're not socketed, they're soldered directly onto the motherboard.
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#5 BeigeBochs
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Posted 29 June 2019 - 07:49 PM
Okay, I'm more clear now. I don't want to make you feel any worse than you do, but in future, try to avoid firmware updates from within Windows. That method is the most risky, since layer upon layer of OS code is running. The safest bet is from within UEFI/BIOS, if that code is reliable, or failing that, from a bootable disc of some sort, using a minimal OS.
As funny as this may sound, of all the UEFI or BIOS updates I have performed over the years, none of the three flash failures I have experienced have occurred when performed from within Windows. Two of them occurred within clean DOS boots, and the third one -- this one -- occurred when run through the UEFI (initiated in Windows of course, but actually performed by the UEFI after leaving Windows). In all cases, I performed the flash procedure exactly as instructed by the computer/mainboard manufacturer (i.e. not performing the flash procedure using a DOS flashing program within Windows 98).
I don't know if the UEFI handles it any differently when the update is initiated within the UEFI setup utility itself, but the fact remains that the process is performed from outside the non-pristine environment of Windows NT and within the supposed pristine environment of this HP Pavilion's UEFI, no matter where it is initiated. Something just went wrong this time.
I sure hope I can get this fixed without having to resort to more physical intervention. The UEFI chip is indeed soldered to the mainboard in this computer, and I am not handy with a soldering iron.
I am far away from the HP computer right now; but in a couple days once I have it within reach, I will try removing the CMOS battery and see if that gets me anywhere.
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#6 Shplad
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Posted 29 June 2019 - 08:59 PM
Sorry to hear that. It's funny you mentioned soldering, as I just came back from 2 hours of miserable microsoldering, which is not my best skill. The regular size stuff I can do great, but this miniature stuff...
Post back with the results of your CMOS battery removal. I suppose it is also possible that your CMOS battery died, though if that happened at the same time it would be a huge coincidence. Do you have a multimeter or know someone who does who can test the battery?
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#7 BeigeBochs
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Posted 30 June 2019 - 09:49 AM
Do you have a multimeter or know someone who does who can test the battery?
The computer had been unplugged for days before I attempted the UEFI flash update. The clock was still accurate when I plugged the computer in and turned it on. The CMOS battery is most likely in good shape.
I hope removing the battery solves the problem. I will be able to give it a try tomorrow.
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#8 pcpunk
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Posted 01 July 2019 - 08:06 AM
I performed the flash procedure exactly as instructed by the computer/mainboard manufacturer
I think this is where you went wrong. There is no BIOS Update on the HP site for this pc, and from what I understand you should not use one other than the HP one, they have been specifically designed for HP.
https://support.hp.com/us-en/drivers/selfservice/hp-pavilion-23-g000-all-in-one-desktop-pc-series/6528335/model/6529775
If I don't reply right away it's because I'm waiting for Windows 10 to Update.
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"I once spent two hours on the phone waiting to speak with HP Customer Service to complain about HP Customer Service" -Dr. Sheldon Cooper
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#9 BeigeBochs
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Posted 01 July 2019 - 09:41 AM
There is no BIOS Update on the HP site for this pc, and from what I understand you should not use one other than the HP one, they have been specifically designed for HP.
The URL you provided does point to the webpage for the computer in question. However, you are mistaken that there is no UEFI (or BIOS as you put it) update for this model. I have noticed that if you set the operating system in the webpage to one other than what this computer came with (Windows 8.1), it will not display a "BIOS" category for this model.
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#10 Shplad
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Posted 01 July 2019 - 09:54 AM
BeigeBochs:
Yes, you are correct! That is really a disaster on HP's part. Support by large OEMs for consumer PC equipment seems to continue to move ever downwards.
How did it go removing the CMOS battery? Did you test it? Note that sometimes a CMOS battery can be low and still maintain the date and time. I've seen absolutely bizarre things happen when a battery is low. I really urge you to test it with a meter.
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#11 pcpunk
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Posted 01 July 2019 - 12:30 PM
Sorry, bad info on my part, forgot it was 8.1
If I don't reply right away it's because I'm waiting for Windows 10 to Update.
eps1.0_hellofriend.mov_mr_robot
"I once spent two hours on the phone waiting to speak with HP Customer Service to complain about HP Customer Service" -Dr. Sheldon Cooper
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#12 Shplad
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Posted 01 July 2019 - 12:32 PM
pcpunk:
You didn't do make any mistake. Newer firmware versions are always relevant regardless of the OS version. HP is the one who messed up.
Edited by Shplad, 01 July 2019 - 12:32 PM.
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#13 BeigeBochs
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Posted 01 July 2019 - 06:43 PM
I tried removing the CMOS battery from the computer today. I left it out of the computer for about three hours. Then I put the battery back in and the computer back together and turned the computer on. Sadly, it didn't work. I still get only a black screen.
Any more ideas?
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#14 Shplad
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Posted 01 July 2019 - 07:33 PM
I can't think of much else. I'd try removing the power plug and letting the system discharge for a day or so and then plugging it in again and trying it.
I'd also check inside to see if some cable or RAM became loose or improperly seated. Check the PSU cables as well. It's unlikely, but possible.
Also, I've seen a very few times when, after a firmware flash, the machine wouldn't boot the first few times it was turned on, but then later did. I don't know the explanation for that, but just don't give up too easily. 
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#15 pcpunk
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Posted 01 July 2019 - 09:19 PM
Wow, this don't look good does it.
What if you boot from a Hirens CD/DVD. Maybe, hopefully, the cd/dvd will boot without any input. Then you could execute the BIOS Update from from the USB in Hirens.
I guess you can't get into ESC and F9 Boot Order at all or see anything at this point?
If I don't reply right away it's because I'm waiting for Windows 10 to Update.
eps1.0_hellofriend.mov_mr_robot
"I once spent two hours on the phone waiting to speak with HP Customer Service to complain about HP Customer Service" -Dr. Sheldon Cooper
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Hp Allin One Computer Scree Os Black and White
Source: https://www.bleepingcomputer.com/forums/t/700108/hp-pavilion-all-in-one-black-screen-at-power-on/
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