Turning on and off after inactivity

When I go to bed at night, and my computer goes to sleep for a while, i don't know how long because I'm asleep, it will do odd things. When i wake up, my computer is turning on, then off, then on, and it keeps doing this over and over without any human interaction. When i unplug the power cord from the computer, then plug it back in, it works, sort of. When i turn it on after doing this, i get a black screen, but a restart will let me use my computer. It never does this unless its sleeping for a long time. Any problems?

Recent Changes:
A new power source
A new graphics card

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Good clues.

Try this next time. Change the power settings from SLEEP to HIBERNATE.

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What is the difference between these two? I just changed it, so I'll see how it works.

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Re: Differences

Nvm, I just read what they are, but how can I use sleep, i'd rather use sleep instead of hybernate.

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Then you get to repair the machine.

It may involve reinstalling the OS and maybe new RAM, motherboard or other. HIBERNATE often is a good cure.

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