Notebook wouldn't wake up after I close and open the lid.

[Rus31]

I recently dismantled my notebook to fix a capasitor problem and change the thermopaste, and after I put it back together I started experiencing new problem:

When the notebook is on, I close the lid and the device appears to be in sleeping mode. After I open the lid again, I press a key (not the on/off button), but it does not wake up as it should.  The only responce I get is the white LED flashing constantly on the right side of the notebook, the one indicating on/off. So it does not wake up and I have to power it off (with long press of the on/off button) and on again. I completely unplugged all the connectors on the motherboard while abovementioned dismantling, so I might have missed one of them while putting it all back together? Is there any switch under the hinge I misplaced or something? Or is it  simply software issue? 

Please help.

[Echo_Lake]

@Rus31

Thank you for posting on HP Support Community.
 

Don't worry understand that your HP notebook is not working correctly. I appreciate your efforts to try and resolve the issue. 
 

To begin with, perform Windows Update and HP Support Assistant:

To check for updates now, select the Start button, and then go to Settings  > Update & security  > Windows Update, and select Check for updates. Install updates from HP Support Assistant: Go to Download HP Support Assistant to install the tool.

1. To open HP Support Assistant, double-click the HP Support Assistant icon .
2. Click My devices in the top menu, and then click Updates in the My PC or My notebook pane.
3. Click Check for updates and messages to scan for new updates.
4. Review the list of updates. Updates with a yellow information icon are recommended. Updates with a blue information icon are optional.
5. Click the update name for a description, version number, and file size.
6. Select the box next to any updates you want to install, and then click Download and install.

And, also run BIOS Update: Follow steps from the link: https://support.hp.com/in-en/document/c00042629

Hope this helps! Keep me posted for further assistance.
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