Since i have built my first PC earlier this year I've been having this problem with it. The screen blackout and then recover (as you probably already know). This usually happens when I'm using an internet browser but happens when i am playing games as well. When the display comes back the audio tends to buzz and be annoying. Also often times my computer freezes with an audio loop of what i was on.
specs
CPU: AMD Athlon X4 860K 3.7GHz Quad-Core Processor
Motherboard: ASRock FM2A88M-HD+ Micro ATX FM2+ Motherboard
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Toshiba Product Series: DT01ACA 2TB 3.5" 7200RPM Internal Hard Drive
Video Card: Sapphire Radeon R9 270X 2GB Dual-X Video Card
Power Supply: Fractal Design Integra R2 650W 80+ Bronze Certified ATX Power Supply
specs
CPU: AMD Athlon X4 860K 3.7GHz Quad-Core Processor
Motherboard: ASRock FM2A88M-HD+ Micro ATX FM2+ Motherboard
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Toshiba Product Series: DT01ACA 2TB 3.5" 7200RPM Internal Hard Drive
Video Card: Sapphire Radeon R9 270X 2GB Dual-X Video Card
Power Supply: Fractal Design Integra R2 650W 80+ Bronze Certified ATX Power Supply