HP 8 G2 clearly turns on but won't boot up

I press the power button on my HP 8G2 and it lights up on the screen, but nothing else, then goes black again

Hey @like2drnkbr ,
Welcome to the HP forums.
I understand you're having issues with your HP 8 G2 tablet.
The first things to try would be a hard reset if you have not yet tried it: While the tablet is on, press and hold the power button for 8+ seconds to force shut down. Turn the tablet back on and see if that helps.
If that fails to resolve the issue you can try a recovery from micro-SD storage:
1. Download the update.zip for your device and copy the file to the root directory of an empty micro-SD card (at least 1 GB, FAT 32 format). Do not unzip this file. You can find the update.zip for your device here: HP - Drivers & Downloads.
NOTE: You will need the exact model number to locate the correct package. There are multiple update.zip recovery images available. Ensure you select the correct download for your region. If your tablet does not boot after attempting to update you may need to try both the KitKat and JellyBean images. For information on finding your product or model number click here: Finding Your HP Product Model Number.
2. Fully charge the tablet and then disconnect the power from the device.
3. Power off the device.
If your tablets micro-SD slot is on the side or bottom of your tablet skip to step 5.
4a. Place the tablet on a flat surface, display panel side down, with the release notch towards you.
NOTE: Before positioning the tablet with the display panel facing down, make sure the work surface is clear of any foreign objects. Failure to follow this caution can result in damage to the display panel assembly.
4b. Remove the back cover. Use the release notch to remove the back cover.
4c. Insert the micro-SD memory card into the reader slot.
4d. Reverse the procedure detailed above to install the back cover and continue to step 6.
5. Insert the micro-SD card into the micro-SD card reader.
6. Press and hold the volume up (may also be volume down, my available documentation for this does not specify) button and power button at the same time.
7. When the HP logo appears on the screen, release all the buttons.
8. When the Android system recovery menu appears, use the volume down button to highlight "apply update from external storage".
9. Press the power button to validate "apply update from external storage".
10. Use the volume down button to highlight the software recovery file, update.zip.
11. Press the power button to select the update.zip file and launch the recovery.
NOTE: Wait until the entire recovery process finishes. The device might seem unresponsive at times (multiple reboots and black screens) when it is performing the update.
If this does not resolve the issue please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the following link to get the support number for your region: Phone Assist Worldwide.
Thanks.
Please click the "Kudos, Thumbs Up" at the bottom of this post if you want to say "Thanks" for helping!
Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
The Great Deku Tree
I work on behalf of HP.

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Quote from: erikFC on 05-November-07, 23:41:04
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""To update anyone watching this, we tried putting the hard drive in a different machine and still had the same boot issues,""
Are you saying that the questionable HD was put in another computer and THAT computer had the same issue as the Professors?
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rainforest,
Starting with the gray screen, give it a little more time to resole startup issues or zap the PRAM for 2 chimes.
Macs were designed to go out and look at all hardware connected to the CPU and report back with details. PCs were never given this feature because Bill Gates said to himself, only smart people will use a computer and they will tell the computer every little thing that it needs to know. Thus, PCs are dumb. They do not look at the floppy drive until instructed, ie. you must tell it that you inserted a floppy disk and now you actually want to look at it. What a thought!
Steve Jobs said, dumb people will use computers so let's make the computer smart. It is that startup review process that gives you the gray screen until it figures out what has changed. Zapping the PRAM is designed to force the CPU to take a fresh look at all devices. If you wait long enough, the review process should finish and give you the smiling face. Some swear by letting the PRAM zap chime three times because once is not always enough.
Everytime you reconfigure your hardware, you create a new startup obstacle.
Is it possible that there is a distinction between j9 and j10? From a purely essoteric design standpoint, yes. From a functional standpoint, no. Both should work and when they do not, you have just discovered an annomily with your motherboard.
I once asked a certified auto mechanic about an electrical problem to see if it was something that was obvious or maybe part of a recall that he could easily spot. He said no. I then asked if he would have to go exploring to find the electrical problem. He said yes. I then asked if the service charge would cost more than the car was worth. He said "absolutely."
Learning what your computer will and will not do is one thing. Fixing it is a whole new adventure.
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