Screen blackouts while gaming

Hello everyone! Hoping someone can help me with this.. Whenever I am playing games on my computer the screen goes black when there is too much going on in the game. It is not a system freeze because I am able to alt tab in and out of the game and the picture restores itself. Originally I assumed it was my monitor because I could still hear sound when the screen would go black. I recently purchased a new asus monitor and the screen is still going black while I'm playing. If someone could please help based on my information I would really appreciate it!

Operating System: Windows 7 Home Premium 64-bit
Manufacturer: Gigabyte Technology Co.
System Model: M68MT-S2
BIOS: Award Modular BIOS v6.00PG
Processor: AMD FX(tm)-4100 Quad Core Processor
Memory: 8192MB RAM
DirectX Version: DirectX 11
Graphics Card: AMD Radeon HD 6670
Chip Type: AMD Radeon Graphics Processor (0x6758)
Power Supply: 550w
 
I did what you said and it seems to have worked! Played a game I normally play with issues and it worked just fine with no blackouts. Thank you so much!
 
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