My PC wouldn't turn on until it did - is it the PSU?

Ctrl Alt Del · Jul 29, 2020

So this morning I woke up to a terrible situation. I went into my study, clicked my PC's power button and left to brew a cup of coffee. Went back to the study a few minutes later and noticed my PC was still off. I tried to repeatedly click on the power button to no avail. I tried unhooking the power cable and reconnecting it, no dice. Removed the CMOS battery and waited a few minutes and it didn't work. So I concluded my PSU had died and ordered a new one.

Then I went back into my study a hour ago a noticed my PC was on. It asked me to reboot my BIOS config (on account of the battery being removed), which I did and it's now working properly. I've tried resetting multiple times and it still comes back to life okay. One thing I did notice is that my peripherals take a while to turn on (keyboard and mouse lights), which usually work much earlier on.

Do I have a faulty PSU that is slowly dying off?

Edit: my PSU is a bronze-tiered Corsair CX750 750w that I have owned since 2016.

super-famicom · Jul 29, 2020

How long have you had the PSU? Of it's been more than 5 years I'd say it's time for a new one for sure.

Xagarath · Jul 29, 2020

That's very likely the PSU - I had a similar situation last year and had to replace mine.

If you want to be certain you can try using a power supply tester first - they're relatively cheap.

Ctrl Alt Del · Jul 29, 2020

super-famicom said:
How long have you had the PSU? Of it's been more than 5 years I'd say it's time for a new one for sure.

I've added model and time of ownership on the OP. I've had it for roughly 4 years now, since mid-2016.

Nabs · Jul 29, 2020

That does sound like a PSU problem. I would play it safe and wait for the upgrade.

super-famicom · Jul 29, 2020

Ctrl Alt Del said:
I've added model and time of ownership on the OP. I've had it for roughly 4 years now, since mid-2016.

4 years? Yeah you can upgrade to a new one. How long is the warranty?

disco_potato · Jul 29, 2020

super-famicom said:
How long have you had the PSU? Of it's been more than 5 years I'd say it's time for a new one for sure.

If I buy a PSU and it only lasts me 5 years, I'm probably never buying a PSU from that manufacturer again.

Ctrl Alt Del · Jul 29, 2020

Xagarath said:
If you want to be certain you can try using a power supply tester first - they're relatively cheap.

Yeah, that's a good tip. Corona makes it tricky for me to go the usual electronics store, but I can order one online.

super-famicom said:
4 years? Yeah you can upgrade to a new one. How long is the warranty?

Corsair's website says 750w gets 5 years warranty, but the box on mine says it's 3.

Bomblord · Jul 29, 2020

The MOBO and PSU are both equally possible culprits.

Lower chance but still possible is RAM and CPU.

Another strong possibility is one of your peripherals has a short in the cable I've had an HDMI, and Displayport cable all prevent a PC from booting or make it boot unreliably.

WBacon · Jul 29, 2020

disco_potato said:
If I buy a PSU and it only lasts me 5 years, I'm probably never buying a PSU from that manufacturer again.

Exactly. I have a 1,000W Cooler Master PSU that I've owned for almost 8 years and it's still going strong. I only recently updated it along with the rest of the system with another 1K PSU with a modular cable design.

Anyone want my old PSU free? LOL (half serious)

Ctrl Alt Del · Jul 29, 2020

Bomblord said:
The MOBO and PSU are both equally possible culprits.

Lower chance but still possible is RAM and CPU.

I REALLY want it to be the PSU because it's by far the oldest component. Everything else on my PC is from 2019.

Another strong possibility is one of your peripherals has a short in the cable I've had an HDMI, and Displayport cable all prevent a PC from booting or make it boot unreliably.

I did remove all peripherals before removing the CMOS battery (it was obscured by my GPU, which I had to remove too) and it still didn't work. My PC is now on with all the cables put back.

Grimminski · Jul 29, 2020

The one in my old computer would do that constantly, because it was over 8 years old.

If it happens again, flick the power switch on the back a few times.

low-G · Jul 29, 2020

disco_potato said:
If I buy a PSU and it only lasts me 5 years, I'm probably never buying a PSU from that manufacturer again.

I've had several EVGA GPUs fail at 5 years or less... Not going to stop me from buying from them. (They have 10 year warranties)

Zombegoast · Jul 29, 2020

Any lights inside the case flash for a second?

My Computer died when I put it to sleep mode Sunday night. The PSU still powdered on after testing it. The only issue from my PSU is one of the connectors for the case fan was faulty and had to use one of them that work or else my PC refuses to boot. I had the PSU for nearly 4 years.

I'm waiting on a new one, hopefully I get it tomorrow

Ctrl Alt Del · Jul 30, 2020

Zombegoast said:
Any lights inside the case flash for a second?

My Computer died when I put it to sleep mode Sunday night. The PSU still powdered on after testing it. The only issue from my PSU is one of the connectors for the case fan was faulty and had to use one of them that work or else my PC refuses to boot. I had the PSU for nearly 4 years.

I'm waiting on a new one, hopefully I get it tomorrow

No lights when I tried earlier, but it seems to working properly now, been using it all day. I also ordered a new one anyway. If this one holds up, I'll keep it as a spare.

My PC wouldn't turn on until it did - is it the PSU?

Ctrl Alt Del

super-famicom

Xagarath

Ctrl Alt Del

Nabs

super-famicom

disco_potato

Ctrl Alt Del

Bomblord

Self-requested ban

WBacon

Capcom USA

Ctrl Alt Del

Grimminski

low-G

Zombegoast

Ctrl Alt Del