PC problem. Help!!!

Aug 18, 2018
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When I turn on my PC sometimes, Only the fan, the keyboard, the mouse turns on but it doesn't show any display at the monitor. Sometimes only the fan will turn on for a bit and for a few seconds it will stop, then start once again. What hardware should I replace?
 
Aug 18, 2018
2
0
10


CPU: Intel(R) Pentium(R) CPU G620 @ 2.60GHz (2CPUs), 2.6GHz
Motherboard: Gigabyte GA-H61M-DS2
Ram: 4GB
SSD/HDD: 500GB
GPU: NVIDIA GT 720
PSU: ATX-600W 20+4 PIN
Chassis: Across ACK-3072-1
OS: Windows 7 Ultimate 64-bit

The PSU is around 5 years.