Question After installing new GPU: keyboard + mouse won't turn on, no display, CPU debug light is on

[ramenluver]

After installing new GPU, keyboard + mouse won't turn on & no display.

Checked the debug section of my mobo, and the CPU light is lit up, currently hoping it doesn't mean the worst....

My build currently is:
CPU - Intel Core i7-9700K 3.6 GHz 8-Core Processor.

CPU Cooler - Corsair iCUE H100i RGB PRO XT 75 CFM Liquid CPU Cooler.

Motherboard - MSI Z370 SLI PLUS ATX LGA1151 Motherboard.

Memory - 2x [Corsair Vengeance LPX 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory].

Storage - Samsung 860 Evo 1 TB 2.5" Solid State Drive.

Storage - Samsung 970 Evo Plus 1 TB M.2-2280 PCIe 3.0 X4 NVME Solid State Drive.

Video Card - MSI VENTUS 2X OC GeForce RTX 4070 Ti SUPER 16 GB Video Card.

Case - Corsair 4000D Airflow ATX Mid Tower Case.

PSU - Corsair CXM 750 W 80+ Bronze Certified Semi-modular ATX Power Supply.

Monitor - Acer VG270 Pbiip 27.0" 1920 x 1080 144 Hz Monitor.

So I recently traded in my MSI 3070 Gaming X Trio to microcenter and bought a 4070ti as a black Friday sale. However, after I had placed the new gpu into my Motherboard and turned the pc on, the keyboard and mouse didn't light up, and there was no display either.

The PC lights up, and the few RGBs inside my case lights up, as well as all the fans, even the new gpu fans, are spinning.

However, I noticed that when my PC is on, the power button should be lit up as well, but even when the PC is on, the power button is not lit up anymore either.

Here are the things I've tried so far:
1) Remove the CMOS battery, wait 5 minutes, place the CMOS battery and turn the pc back on.

Still not fixed.

2) Moved the GPU to different slots on my Motherboard.

Still not fixed.

3) Switched the SATA connector slots on my GPU's adapter cables

Still not fixed.

4) Took the RAM sticks off, cleaned them, then put them back in the same exact order.

Still not fixed.

5) Took my GPU out entirely and tried turning PC on and see if I can access the BIOS using the integrated GPU on the Motherboard.

Strangely enough, the keyboard and mouse still won't turn on, plus there's no display at all either

6) Switched to different monitors

Still not fixed.

The 7th method I was going to try out was to try and switch the PLED + and PLED - to alternative slots on my motherboard, but when I tried reading the Motherboard manual, I saw that it didn't have any alternative slots for the PLED + and - slots.

I don't know what else to do, so I'd really appreciate any help in this

 

[Aeacus]

Strangely enough, the keyboard and mouse still won't turn on, plus there's no display at all either

In this case, one of the following or all of them, are dead: CPU, MoBo, RAM.

Last ditch effort: Try with 1x DIMM at a time. Also, try individual DIMM in all slots. If system boots up in any configuration (8x possible options), then either one of the RAM DIMMs or RAM slots are toast.
If still no dice, i'd look towards CPU or MoBo issue.

To test CPU/MoBo, you need 2nd, compatible, known to work parts, to test which of them is dead.

PSU - Corsair CXM 750 W 80+ Bronze Certified Semi-modular ATX Power Supply.

At best, mediocre quality PSU. Good enough to power office PC without dedicated GPU. But nowhere near the build quality to power high-end gaming rig, which your PC is.
So, it could very well be your cheap PSU that killed your hardware.

Since PSU powers everything, it is the most important component inside the PC.
Hence why NEVER cheap out on PSU! Also, never buy used PSU either.

So, look towards new PSU as well.
Take your pick: https://hwbusters.com/best_picks/best-atxv3-pcie5-ready-psus-picks-hardware-busters/3/
All of them listed there are good PSUs.

 

[John Chesterfield]

3) Switched the SATA connector slots on my GPU's adapter cables

SATA connectors? Are you using a SATA to PCI-E adapter? If so, there's your problem.

 

[thestryker]

Make sure the EPS12V power connector is properly plugged in on the motherboard.

I'm assuming with regards to powering the new video card you're just talking about plugging 8 (or 6+2) pin PCIe power cables to the adapter for 12VHPWR. This is the only power/adapter connections you should be using.