How do I "wake" up my computer from sleep or hibernation?

putting a computer to sleep is not the same as hibernation because sleep mode still is technically powered on it's just in a relaxed state or low-powered state whereas hibernation takes everything that's in Ram writes it to hard drive and then completely Powers down hope that helps

If it is in sleep pressing any key or moving the mouse will generally wake it up. If you left the computer unplugged in sleep mode then it most likely ran out of power. If your using hibernate I would recommend not using it as it has so many issues.... :) If you have to hit the power button to wake it up then it's either shutdown or in hibernate. FYI there will generally be an amber light on to indicate sleep mode. If no lights it's most likely not in sleep mode.
Comment if you need additional assistance.

If you use Windows 7, u might have hybrid sleep activated. This is similar to hibernate. When u choose SLEEP, your computer goes to hibernate. Sometimes this hibernate just hangs. You have to reboot computer.
Try pressing the power button for several seconds (10-15). It should power off the laptop.
If not, unplug the charger and remove the battery for a few minutes. Then try to start it up again.

You should check the "Power Options" when the computer "Sleeps" & "Hibernates". Go to the "Control Panel" if you Win 7 or below, if you have Win 10 just type "Power" on the "Search Box" on the bottom left of the screen and then click "Edit a Power Plan" and set when the Computer "Sleeps" and when it "Hibernates". Basically when you move your mouse you are waking up the Computer from "Sleeping" or "Hibernating". Goodluck.

POWER OPTION
control panel---->power options--->change plan setting--->

Turn off the display-never
Put the computer to sleep-never
control panel---->power options--->change plan setting--->advanced power setting
-set hard disk "turn off hard disk after" to never
-set Sleep "Sleep after" to never
-set hybrid sleep setting to off
-set hibernate after setting to never
Restart pc
POWER OPTION
control panel---->power options--->change plan setting--->

Turn off the display-never
Put the computer to sleep-never
control panel---->power options--->change plan setting--->advanced power setting
-set hard disk "turn off hard disk after" to never
-set Sleep "Sleep after" to never
-set hybrid sleep setting to off
-set hibernate after setting to never
-set display to never
Restart pc

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)

Usually, to wake from sleep pr hibernate, you just need to press the "Power" button of your laptop. It will not turn it off or restart the laptop if it is in the "sleep" or hibernate mode. Pressing any key usually wake it up. The default way is to press the power button as if turning it ON for the first time.

I rebuild these systems all the time and I have to tell you I just shut off the hibernation which is what the problem is. Go to power options in the control panel and click the hibernation tab and uncheck the box. That way you save the disk space and the aggravation of trying to wake up the system. Let the computer go into standby if you want but you really need to turn off the hibernation...

press and hold the power button down for about 5 secs. The computer will shut down. Restart it and right click on the desktop, go to properties then look for screensaver tab , then choose power options, click on hibernation tab at the top and uncheck enable hibernation. Or choose stanby options and choose a longer time before the computer goes to sleep.

Hit the keyboard keys. It is better to just turn sleep and hibernate off and just use a screen saver or tun it off.