PC powers on, but no power to peripherals

[glarby person 🏍]

Hello,

I've been having an issue where I had random reboots and it came down to being an issue with the motherboard (Z97 Gaming 7), so I sent it in to get it replaced with a refurbished one. Fast-forward to a few weeks later (this past Monday), and the motherboard arrives. I build my PC with the new (refurbished) mobo and it worked fine for the past 2 days. I wake up this morning and see it's in sleep mode like normal. I click on my mouse, it turns on. I click on my keyboard, it turns on. I then hit the power button to get it out of sleep mode and nothing happens, my monitor says no signal. I hold the power button down to reset it, and when I turn it back on, none of the peripherals turn on. All the lights in the case turn on, as well as the fans, but my mouse, keyboard, headset, and monitor do no seem to be getting power. Well shoot, another issue.
Before the new mobo arrived, I got a new GPU (EVGA GTX 980), new RAM (Hyper X 16gb), a new PSU (EVGA SuperNOVA 750 G2 80+ GOLD), and a new heatsink (Cooler Master Hyper 212 EVO).
I had the new RAM and PSU in my old rig for a few days before shipping off my mobo, so those are fine. I'm really hoping it isn't another motherboard issue. I don't think it's the GPU, I REALLY hope it isn't the GPU.

I'm at school right now, so I'm hoping for suggestions to try when I get home in a couple hours.
Thanks in advance!

-Flying Cattle

Specs:
Mobo: Z97 Gaming 7
CPU: i5 4690k
GPU: EVGA GTX 980
RAM: Hyper X 16gb
PSU: EVGA SuperNOVA 750w

[_I_]

windows 10 has isuses with sleep mode
disable it and use power off instead
boot time wont take long if you have a ssd

[glarby person 🏍]

Thanks for the reply!
I'm not sure if that would help since I'm using Windows 7.
And how would I be able to disable it if I can't access anything on my PC?

[_I_]

yes
it will just shut down instead of going to sleep
sleep store ram to the hdd and restores it on boot so it boots faster
but shutting down is better since all programs are killed and started again
if you have a ssd, boot and restore times will be very close

[The Muppet Surgery Special]

Hibernate has never been Window's strong point :)

Your luck depends on hardware :)

Don't use that either :)

[glarby person 🏍]

Any idea on which hardware I should start testing? And how I should test it?

[The Muppet Surgery Special]

Originally posted by Flying Cattle:

Any idea on which hardware I should start testing? And how I should test it?

Power supply output and motherboard / peripheral connections.

You could check them with a voltmeter.

[glarby person 🏍]

I don't think I have a voltmeter, but I could pick one up.
UPDATE: After leaving it on for a few seconds, it will shut off on its own and restart: a reboot loop.
I tried re-seating the RAM and testing them each on their own, but no difference.

[glarby person 🏍]

UPDATE 2:
I removed the CMOS battery for about 15 minutes. When I put it back in and powered-up my rig, my monitor got a signal, though it looks like it froze before getting to the BIOS. I shut it down and tried again, but this time only my headset got power.