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pc screen turns black and restarts

Hello guys, I was just using my pc and my monitor turned black and restarted in 1 second, it happened couple of times, then I upgraded PSU but it didn't help. This problem happens very seldom but it's very annoying, and I wonder how to fix this problem, here are my pc specifications:
CPU: AMD A8-7600
GPU: Geforce GT 520
4GB RAM (DDR3)
Motherboard is something lenovo, with 14 pin connector and I have an adapter to connect 24 pin PSU to 14 pin.
500GB< HDD 
450W PSU 

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