monitor, keyboard, mouse not working but power ok

My son just returned from holiday and powered up his gaming pc. It powers up ok but no signal to the monitors, keyboard or mouse. The fans work, the storage hard drive is spinning, dvd drive has power, graphics card has power lights on and when an additional external device is plugged in then it gets power from the same port that the keyboard or mouse is plugged into. Picture attached of system with power on.

The monitors work with another computer, as do the keyboard and mouse. No visible damage to the motherboard. Worked fine before the holiday but not on return. Was left plugged in.

Have tried disconnecting everything, power drain, removed ram and retry with one slot filled each time.

Windows 10. I can post the full build but was wondering what the trouble shooting order for this kind of problem should be?

We built the pc a couple of years ago. Running with no problems. No software changes prior to going on holiday and was working fine. Neither of us are super experienced with tech troubleshooting but not afraid to get stuck in. I actually enjoy it, my boy just wants to play some games.

No library of spares hanging around, so I wanted to start with the most likely stuff first.

Searching online points to PSU, CPU and ram as places to start. Any recommendations as to the order?

Any suggestions most appreciated.

 

Thanks for the replies.

Regarding the PSU, point taken and I'll look to upgrade that at some point if that isn't the source of the problem. It has been running fine with that PSU for a number or years. Although a custom build there is no playing around with clocking and such.

PSUs, is it possible for them to selectively fail e.g. put some power through but not enough? I discounted the PSU as some power is clearly being supplied but seems that is an incorrect assumption. Is it? If it is incorrect then I'll look at that.

Trying start up without monitors plugged in still produced no signal to mouse or keyboard.

NB. The same USB ports used for the mouse and keyboard do work when another external is plugged into them (a music mixing keyboard). So does that mean that it is not a power supply issue?

I don't know about power cuts but there was certainly an thunderstorm when he was on holiday. He lives with his mum just around the corner. Nothing else in their house appears damaged but a power surge could be a possibility. So RAM and CPU most susceptible? In that order?

 

Ps. Two monitors both HDMI. Motherboard no onboard graphics card.

Would it help to post the full build spec?

 

No surge protector. Just plugged into an extension lead / socket set and into the wall. The power switch on the socket set was off. Not sure if that makes a difference.

So the build is as follows:

MSI 970A-G43 AMD 970 ATX Motherboard (PCI-E, Socket AM3+)
Corsair CP-9020048-UK Builder Series CX600 ATX/EPS 80 PLUS Bronze Power Supply Unit, 600 W
AMD FX8350 Black Edition 8 Core Processor (4.0/4.2GHz, 8MB Level 3 Cache, 8MB Level 2 Cache, Socket AM3+, 125W, Retail Boxed)
Deepcool Captain 240 EX
HyperX FURY Series 16GB (2x 8GB) DDR3 1600MHz CL10 DIMM Memory Module Kit
HyperX FURY Series 8GB (2x 4GB) DDR3 1600MHz CL10 DIMM Memory Module Kit
Asus AMD Radeon R9 290 DirectCU II Graphics Card (4GB, GDDR5, PCI Express 3.0)
Kingston Technology 480GB Solid State Drive V300 SATA 3 (Windows boot drive)
Kingston Technology 240GB Solid State Drive 2.5-inch V300 SATA 3
WD 1TB 3.5 inch Internal Hard Drive

Indeed, it is booting from one of the SSDs, so difficult to tell. The HD is spinning but that is not really relevant.

So testing the existing PSU and seeing if that is the source of the problem / getting a higher spec one anyway seems like the recommended next step? Any suggestions as to what would be an appropriate PSU?

Thanks.

 

Thanks for that. I'll follow up on some of your suggestions.

 

Sorry, that was incorrect - one HDMI and one displayport.

I'll try all that but will not have time until next weekend. I'll post an update.

I seem to recall the first boot device is set to the DVD, at least I made a boot DVD and wrote clearly on it "Boot DVD"! Yes, the second boot device is 480GB SSD.

I'll try the PSU testing first and replace that if needs be. If it does not need replacing then I'll try 2, 3, 4 above. I'll then post an update here.
Thanks.

 

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