[SOLVED] PC doesn't power-up (weird behaviour)

[MatthijsNL]

In 2016 I build myself a new PC and until this year no problems what so ever.

But the last weeks it sometime just doesn't power-up and I have no idea why.
So this is the reason I gone ask in the forum (I hope in the right topic as i'm a newby).
I really cannot understand this weird behaviour... so need some advice.

First of all the problem description:
I use Windows 10 and shutdown normally.
No issue and PC powers-off normally (so far I can see).
But sometime I am not able to power-up again. It doesn't do anything.
Sometimes it helps to just unplug the power cable and plug it in again, which starts the PC (without pressing the power-button).
But any time this also doesn't help ... I just to a lot of this, unplug cables, waiting without plug-in the power, etc.
And at some time ... when plugging the power cable back in power-supply it suddenly starts up again.
As you can image it's very frustrating ...

What I did so far:

• Unplug the power cable to power supply
• Unplug all internal power cables, including the ones to motherboard and video-card
• Refitted the memory
• Tried a differed power supply (though 500W instead of 650W)
• Checked the power-button cable

I didn't do a reset yet, as I'm afraid to destroy my raid configuration.

Configuration (see also 2016 Building new PC):

• Gigabyte GA-990FXA-UD5 R5 (rev. 1.0) Motherboard
• AMD FX-8370E Black Edition CPU with a Alpenföhn Ben Nevis CPU Cooler
• Antec EDGE 650W Power Supply
• 2x Kingston HyperX FURY 8GB DDR3 (HX318C10FWK2/16) Memory
• Gigabyte GeForce GTX 950 Xtreme Gaming (GV-N950XTREME C-2GD) Video Card
• 2x Samsung 850 EVO 500GB SSD
• 2x WD Blue 1TB Hard Drives + 1x WD Blue 6TB Hard Drive
• LG Internal DVD Rewriter GH24NSD1

This all in a Fractal Design Arc Midi R2 Case with several fan's.

Any advise what to check .... should I replace the power supply anyway?

Thanks in advanced,
Matthijs

 

[COLGeek]

This does appear to indicate a failing PSU. However, when you swapped PSUs, did the problem go away?

 

[MatthijsNL]

No, I installed an old one (only 500W) but without the HDU's .. only the two SSD's and still didn't start.

I guess I also have to check the BIOS ... if there is anything about starting after power-loss. Because it's strange it starts by only plugging in the power.

 

[COLGeek]

Pulling the power cable "resets" the PSU in a matter of speaking. You are really down to the PSU and/or a defective motherboard as the likely culprits.