After holding down power button, PC won't turn back on

Long story short: desktop computer was acting up, so I held down the power button to temporarily cut power to it -- but ever since, it hasn't responded to anything I've done.

The fuller story: I use a custom-built desktop PC which hasn't given me any trouble until today. I had put it to sleep on leaving the house, and when I came home, I tried to wake it up (by clicking the mouse button, which normally works). The computer seemed to respond -- i.e. the lights on the tower changed and I heard the fan kick in -- but nothing happened on the screen. Thinking it was probably a monitor issue, I double-checked the monitor's connections, but that all seemed to be working (i.e. the connections were all in place; the monitor was receiving power and showed its start-up screen when I turned it off and on).

Thinking that a simple restart might solve whatever was going on, I pressed the restart button on my tower, but that didn't seem to do anything. Then -- probably hastily -- I held down the power button, cutting power to the PC. That was the last time I've seen any lights on the tower, or gotten any response from the computer whatsoever. Ever since holding the power button down for a few seconds, it's just had all the symptoms of a PC with no access to power: the buttons don't do anything, there are no lights, nothing.

I'm pretty certain that it *is* getting power. I've put it in a couple of different power outlets that are currently lighting lamps, and gotten the same (null) result. I've double-checked the connection between the power outlet and the power supply, and I don't see anything wrong. I'm not sure what was going on with the computer at the beginning (i.e. why it wasn't waking from sleep like normal), but now I'm just trying to deal with this more fundamental problem, which is -- how can I make the power button turn it on again?

Any help would be massively appreciated. I really need this computer back ASAP for my study. I'm running Windows 10, and here are some hardware specs, on the off-chance they might be relevant:
MOTHERBOARD: Gigabye G1 Gaming GA-Z170N (Mini ITX)
CPU: i5 6600k
GPU: Sapphire AMD r9 390x 8gb
RAM: 16gb DDR4 Ripjaws
SSD: Crucial MX300 1tb SSD
HDD: WD 1tb
CASE: Bitfenix Prodigy

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(NT) Maybe a
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Sorry ! I hit enter too soon

I was thinking that A SSD or HDD isn't working ?

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Hmmm, I don't think so. Even if I didn't have a hard drive in there at all, I should still be able to power it on and boot up the BIOS, right? If it was just a hard drive issue, I think I'd be seeing more responsiveness from the PC than I currently am. As it is, I've got nothing -- it's just acting like it has no access to power, even though it does.

Because of that, I'd guess that the trouble might be the power supply, except that it only started once I held the power button down for a few seconds. That doesn't really seem like the sort of action capable of breaking a power supply's hardware.

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R. Proffitt's the pro

so do as he asks.
He'll get ya going Wink

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This is where

I reduce whats in the PC. Since the CPU has graphics we don't need the GPU. What else can you remove?

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Check the Power Switch

On the motherboard there's a multi-pin connector called FPanel (Front Panel). Consult your motherboard manual to see its location. (I easily found and downloaded the user manual from Gigabyte's support website, no problem.) Two of those tiny pins connect to the power switch on the front of the case. You can test for a faulty/broken power switch. First, remove the power cord from the rear of the computer. Second, double-check you removed the power cord! Next, remove the side panel of the case. Locate the FPanel small row of connector pins. Unplug the Power + and - wires from those pins. Plug in the AC power cord on rear of computer. Using a small screwdriver carefully touch those two little Power pins both at the same time. Doing this bypasses the front panel power switch. The computer should instantly power on and boot up. If it does not then you possibly have either a bad power supply, a bad stick of memory or a burnt-out cpu.

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AC power cord unplug

Try this, unplug the power plug at the power supply usually about 10-30 seconds then re-plug it in. Some power supplies sometimes don't reset from this condition. By disconnecting the power you reset the power sensing circuitry to indicate power off and tell the supply power good when it is re-plugged into the ac source.

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Power on problem?

Just had something like this happen to a friends computer I built years ago. It was a dead SSD and with it removed everything worked fine. As a rule, remove everything you can, expansion cards (networking, video and sound cards) and unplug the drives and try it. If it works, start plugging things in, one at a time.
Also if it won't power on with everything removed, I have found that removing that reinstalling the CPU has fixed the problem. If it still won't power on after that, remove the RAM and see if anything lights up. Next step is a new power supply. Still dead, possibly the mother board died. Good luck.

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After holding down power button, PC won't turn back on

I'd bet your problem is the "Button Cell -2032" ... Most likely it measures 3.30 or lower on a volt meter... Buying a new (Fresh- good use by date) and installing it will clear up this problem.

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Get a new computer

Try getting a new computer and start that one up and use that one until your old computer starts to work again. This helped me when my computer wouldn’t turn on again or even try turning it on and off again,but I would suggest getting a new computer.

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