PC turns on but monitor and peripherals do not

[BlackMamba23]

I'm experiencing a problem with my custom built PC after 3 years running time. It started to occur a few week(s) after moving house. At first it was the PC turning on (fans, gpu, lights) but the monitor and all usb-powered peripherals weren't responding, after a few restarts, it would begin to work. However currently the PC still does the same start-up problem, but restarting doesn't work anymore. I've tested some of the components on another rig; the gpu, ram, hard drives, peripherals and monitor are all working fine, the 3 components I'm unsure of are the CPU, motherboard and PSU. Is some way I can isolate the problem, so I don't have to replace unnecessarily. I've tried clearing CMOS, that too did not work.

My PC:
i5 3570k OC@4.4GHz with a xigmatek aftermarket cooler
MSI Z77A G-41 motherboard
Gigabyte GTX 970
HyperX 16gb ram
HyperX 120gb ssd as OS drive
1tb HDD
2tb HDD
InWin 700w desert fox PSU semi-modular
CM enforcer case
BenQ XL2411Z 144hz monitor

Pretty sure I've covered almost everything haha. If you require anymore information please let me know!, thank you

 

[scout_03]

unplug both hdd and use the ssd only to boot also did you try to use another sata cable from motherboard to ssd and recheck all power connector on the board since you move it around something could have came loose

 

[BlackMamba23]

unplug both hdd and use the ssd only to boot also did you try to use another sata cable from motherboard to ssd and recheck all power connector on the board since you move it around something could have came loose

I've just tested this, the same problem persists. Just want to say, I took the whole system apart about 3 times exchanging components to single out the problem. So nothing is wrong with the connections. SATA cables are also good since I tested them on another system. Everything leads to either a faulty CPU, motherboard or PSU. I'm just unsure which...

 

[scout_03]

since it been move around inspect the board and to test psu if you could have another one to made test that would be great .

 

[BlackMamba23]

since it been move around inspect the board and to test psu if you could have another one to made test that would be great .

I've inspected the motherboard countless times, nothing looks out of place or any pins being bent. I tried out another PSU in the system and i get the same result. I will test another CPU in the motherboard to see if that's the issue, I think it's leaning more towards that...

 

[scout_03]

since you have onboard video chipset remove gpu and try to boot with monitor plug to it before getting another cpu .

 

[BlackMamba23]

since you have onboard video chipset remove gpu and try to boot with monitor plug to it before getting another cpu .

Already tried
I have a spare CPU I can test with. If it works, then the problem is definitely my CPU. I'm going to remove it first to see if any pins are bent...

 

[scout_03]

let hope this is it .