HP DC7800 doesn't wake up (and power switch does nothing!)

NO OS stated at all, w7/8 or 10 , did it ever get OS upgraded, from 7 or higher? if yes say so. ok?
Do the HP.com long reset yet?>
answered here 10,000 times and 1 million times at HP.com
This is an ALL-IN-ONE PC. 5 years old, (can be)
not a desktop real (atx) not laptop or note book.

Most of these odd duck PC have special keys for Unsleep.?
but this fake desktop has no huge battery.
so you unplug the power pack from the wall
and hold the power button on for 30seconds and release it.
then try normal.
'
the manual on this PC cover sleep did you read it.
did you ever upgrade the OS? if yes, BINGO. a problem.
learn that sleep mode only works correctly if all drivers are correct for you unstated OS (matched perfectly from HP)
and worse in hibernate mode, more complex. that is.

using slate mode? or hdmi
read page 4 (and page 45 on 30min sleep rule new)

http://h10032.www1.hp.com/ctg/Manual/c04162993











quote. how to unsleep or WAKE this PC is stated in the above manual. I pasted the words here.
Examples include the user pressing the power/sleep button, receiving an input signal from an input device, receiving an input
signal from a network connection with t
he Wake On LAN (WOL) feature enabled, etc.

typing wakes it, mouse wakes it.
if you have power setting set up wrong, the mouse and keyboards go dead and will not wake the PC from sleep.
so hold the power button on for longer, time.
the power button I think is the only button that never sleeps.
note how that button has very unique name, on this PC.

Configure your Windows 7 PC to go into sleep mode automatically when it is not used for a certain amount of time. Click "Start" and select "Control Panel." Click "System and Security." Click "Power Options." A menu opens. Click on "Choose when the computer sleeps" and select the number of minutes of inactivity. You can also set a separate time interval to put your monitor into sleep mode. If you set both to 10 minutes, then your PC and monitor will automatically go into sleep mode after 10 minutes of inactivity The computer will power-down and turn off unnecessary systems, including the monitor, while keeping the memory active so it can start back up quickly and still have all programs up that were being used prior to entering sleep mode. While this is a helpful feature that can extend the battery life of a laptop, it can result in errors where the computer won't power back up. You can usually solve the problem quickly.

Look for a sleep-specific key on the keyboard. It will usually be near the top row and have a symbol of a moon on it. Press this key as some laptops only respond to that command to come out of sleep mode. Press the "Enter" key to see if that will cause the computer to respond. Move the mouse back and forth several times and click the mouse button. Hold down the power button for 5 seconds if the previous methods have not worked. This is another common method for exiting sleep mode for many laptops. It may also trigger a full computer restart which would also solve the sleep mode problem. Unplug the laptop and remove its battery.
Reinsert the battery and then plug the laptop back in.

This should cause a full restart when the power button is pressed. Download the latest video drivers from the website for your video card manufacturer. Old drivers can sometimes cause problems with the laptop's power functions. See if your computer manufacturer has an updated BIOS on its website. The BIOS (basic input/output system) is the firmware that controls the initial boot processes for your laptop. Computer companies will release updated BIOS firmware if they get multiple complaints of boot or power problems. The BIOS interfering with Windows Power Manager is a frequent cause of sleep mode problems. Adjust your BIOS settings by rebooting the computer and pressing the appropriate function key when prompted on start up. It will normally be F1, F2 or F3, and you will often see a message during start up saying to press that key to enter the BIOS. Experiment with the BIOS settings by scrolling through the menu and locating Power Management. Increase the amount of time the BIOS allows before hibernating to make sure it is higher than the the Windows power setting. This can help eliminate conflicts between the BIOS and Windows concerning power shutdowns.

Sounds like it is locked up. There should be a power switch on the back. Switch it off, leave it off for a few minutes, then turn the back power switch on again and push the front power switch. If no rear switch, pull the plug. Windows doesn't like hard power downs, but if your system won't recognize the keystrokes or mouse movement, tere is nothing else you can do.

Hey there, Normally simply pressing a random key on your keyboard or moving your mouse should wake it up, if it doesn't though I think the easiest way to solve this is to simply turn off the sleep mode after x amount of time.
If you have windows 7, press the start button and type in "power options", go ahead and open power options and there you will be able to set the time it takes before your PC shuts down, and you can also set it to never.


If you still wish to use this feature but just want to be able to it's a bit tricky and it won't even work for all PCs but if the keyboard waking isn't working, then it's probably because your pc does have this feature. When your PC is off, boot it up again and enter the bios by pressing F10 i believe it is for HP. And somewhere you should be able to set which devices are allowed to wake up your computer, all devices are probably disabled now, so go ahead and enable the keyboard to wake up your computer. Now save and exit, and the next time your PC goes to sleep mode you should be able to wake it up by pressing a key on your keyboard.


I hope I was able to assist. If I was, please don't forget to rate this solution.

Check for windows updates.

They can change the sleep button to a shutdown button and sometimes cause it to not respond and do nothing instead.If you are feeling frisky go ahead and regedit the offending action away

open up regedit.exe using the start menu search box and then browse down to the following key, creating the key if it doesn't exist.

HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsUpdate\AU


Add a 32-bit DWORD value called NoAUAsDefaultShutdownOption with a value of 1. No reboot should be necessary.
Now our Sleep button should be back to the way it was, but if you wanted to use the Install Updates and Shut Down option, it's still available via the shutdown menu

If pressing down and holding the restart/start button doesn't wake it up you might try Control + ALT + DELETE keys (together) - that will reboot it though. And if that won't work then you might have to pull the battery to reset it.

It seems that some laptops have a problem with vista and sleep mode, in particular, and sometimes hibernate too. You can try going under POWER OPTIONS under Control Panel and setting everything back to default, saving it, then resetting it again. Also it's best to avoid using sleep mode if possible to avoid problems.

If the problem developed after a recent install or updating you may need to go to an older store point to fix the problem. Personally, I just avoid using these settings as much as possible and use regular shut down and a screen saver for times when I need to step away from laptop for short periods of time.

1. you will need to go into you BIOS settings for the mother board to disable the sleep mode.
2. You also have a " sleep mode" in your Windows environment.
Check how to in the "help and support" link at the start button or Windows Orb ( for Windows 7)

ok got t o your power mangement setting and extent the time of sleep and do change the setting of your mouse power management in Device manager. wake system when in sleep mode something like this just check it and enjoy.

If you can restart it and it starts up fine, then I would go into the power settings and disable sleep mode. Every computer is different on how to wake a sleeping computer, so you could read through your manuals and find out for yours, but I just disable sleep mode on all computers so i dont have to hassle with it.