How much less energy does a computer use on sleep?

My computer was left on sleep mode last night and when I went to use it this morning the screen was black and?

My computer was left on sleep mode last night and when I went to use it this morning the screen was black and so I tried to re-start and nothing. After about an hour I used the computer with just using the battery it did come on but when I went to use the power cord it went black again. Help
Answer:

power it OFF. keep pressing the POWER button until it turns off. and turn it back on.then go to your power settings ( it is under the control panel - or right click on your battery on the taskbar) and take it off sleep mode / hibernating option, Windows is Buggy when it comes to sleep mode and hibernation. some times it wont even wake up. SO take that option OFF. personally i dont use windows anymore. it was too bloated too slow too retarded for me to use on my machines. I switched to linux 4 years ago. (open source free operating system)

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