Pc doesnt connect to monitor, keyboard or mouse. HELP

[SindreBraten]

I have gotten a problem with my computer. I was just going to the supermarket and put my computer to sleep mode, when i came back my computer wouldn't connect to my monitor and the keyboard+mouse did not work.. I unplugged my pc for 8 hours and came back and it world again but when i turned it off again, the exact same problem happened. All the fans and LED's inside the pc works, but it doesnt connect to anything, anyone knows what problem i am facing?

My specs is:
Mobo: MSI B85M-G43
GPU: Gainward NVIDIA geforce GTX 760
CPU: Intel i5-4670
PSU: Corsair CX 600M, 600W
RAM: Kingston DDR3 HyperX blu 1600MHz 16GB
OS: Windows 10, 64 bit

 

[GhislainG]

Most likley the PSU or the motherboard, but did you rule out the GPU by removing it and connecting the monitor directly to the motherboard? Can you test with a different PSU? It doesn't need to be powerful for that test; an old 300W PSU is good enough.

 

[SindreBraten]

I do not have another psu to test with unfortunately, i have tried connecting to monitor straight into the motherboard but it didn't work. I have also tried unplugging the cmos battery but it seems like that didn't do anything

 

[GhislainG]

You can't easily fix it if you don't have spare parts to determine which one is defective. Can you borrow a PSU? If not, then bringing it to a shop would be easier since they have replacement parts

 

[SindreBraten]

I could probably borrow one from a friend, so the psu is what most likely is the problem?

 

[GhislainG]

I could probably borrow one from a friend, so the psu is what most likely is the problem?

It's much easier to try another PSU than another motherboard; however you could start with the motherboard if a friend has a similar one and is willing to lend it to you. Personally I'd start with the PSU.