Windows 7: Win7 x64 turns off the screen and cannot go back

I left my laptop running fine last night and Windows 7 turns off my display after 5 mins of inactivity. So when I woke up in the morning the screen was black, the problem is that I cannot do anything with the laptop anymore. Pressing keyboard keys or moving the mouse doesn't make the display go back as it used to be. I can also see that the HDD LED activity light is not flashing anymore. The laptop obviously froze so I had to hard reboot. This is not normal, what could be causing it? I tried looking at Event Viewer and I found nothing suspicious, there was the "expected" Kernel-Power error stating that the shutdown was unexpected, simply because I had to hard reboot. Help would be much appreciated. Thanks.

Can you get to safe mode?

Yes I can.

I have no problems with my computer now. This just happened last night but I don't know if it will happen again. The computer just turned off the display a few minutes ago and I did not have problem going back.

OK Kevin forget about it for now, enjoy your computer. If you are school age use it in class. If it happens again, try this.

Alright. Well I'm not at school age anymore but I use it as my main computer. I just really wanted to know what was the cause of it All my power settings are at default too.

Type cmd in search
In cmd type device manager.
Look at all the cards, any yellow warnings that a card or driver is defective?

Update your graphics driver

No yellow warnings or whatsoever. All my drivers are updated, I'm quite obsessive compulsive about them. And yes, my graphics driver is also updated.

Try this scan
SFC /SCANNOW Command - System File Checker

If no significant errors download and run the full scan for malwarebytes, be sure to update before using. Run full virus scan

What is the make and date on your graphics card driver?

I've just done sfc /scannow and it repaired some errors but mostly with codec files I think. Should I attach the text file of the process? In the guide, it is said that if I don't see "no errors" after the scan, I should do system restore. Should I still do system restore if the process already repaired some of the integrity mismtaches?

I will try malwarebytes and nod32 full scan now.

The make and date of my graphics card driver is 8.17.12.5947 and 8/21/2010, respectively.

Is that an ATI card?

SFC is fine.