PC just shuts off with buzzing?

Barca4Life

Banned
Local time
9:00 PM
Messages
57
Location
Zagreb, Croatia
Today I was playing Football Manager 2012 and suddenly my monitor goes black, but pc is still working and every few second makes short kind of buzzing. I cant turn it off with button, only if I change the switch from back of the case.

What it could be?
 

My Computer

OS
Windows 7 Ultimate x64
CPU
Intel i5 2500k @ 3,3GHz
Motherboard
ASROCK P67 Pro3
Memory
16GB
Graphics Card(s)
nVIDIA GeForce GTX560
Monitor(s) Displays
Samsung 2032bw
Screen Resolution
1680x1050
Anyone?
 

My Computer

OS
Windows 7 Ultimate x64
CPU
Intel i5 2500k @ 3,3GHz
Motherboard
ASROCK P67 Pro3
Memory
16GB
Graphics Card(s)
nVIDIA GeForce GTX560
Monitor(s) Displays
Samsung 2032bw
Screen Resolution
1680x1050
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