Nearly 10-Year-Old PC Suddenly Won't Display Anything — Tried 3 GPUs, Reset CMOS, Rebuilt Everything. Dying Motherboard or PSU?
Hey everyone, I really need some help diagnosing my PC. It's a pretty old system, roughly 9–10 years old, and I'm starting to wonder if some of the original components are finally reaching the end of their lifespan.
I've spent a lot of time troubleshooting this, and I'm honestly running out of ideas. I'm mainly suspicious of the motherboard or power supply, but I don't want to spend money replacing something that might not even be broken.
PC Specifications
- Motherboard: ASUS ROG STRIX Z270E GAMING (2017-era motherboard)
- CPU: Intel Core i7-7700K (7th Gen, released in 2017)
- GPU: RTX 3060 Ti (refurbished, purchased around a year ago)
- Previous GPUs: 2x GTX 1070s (one EVGA, one unknown brand), originally running in SLI
- RAM: 32GB Corsair Vengeance DDR4 (2x16GB installed)
- Extra RAM: 16GB Corsair Vengeance DDR4 (2x8GB, spare kit, not installed alongside the 32GB)
- PSU: Corsair RM750 750W (possibly original from 2016–2017)
- CPU Cooler: Corsair liquid AIO
- Case Fans: Connected through a Thermaltake fan controller
Background — This Is a Very Old PC
For context, this isn't a new build.
The PC originally dates back to around 2016–2017. I received it for my 15th birthday and have personally been using it for about a year.
When I got it, it already had an Intel i7-7700K, an ASUS Z270E motherboard, and two GTX 1070s running in SLI.
Most of the system is still based on that older hardware.
The motherboard and CPU are from the 2017 generation, and I'm pretty sure the Corsair RM750 power supply is also from the original build.
That means some of these components could be approximately 9–10 years old.
I know computer components can last a long time, but I'm wondering whether age-related hardware failure could explain what's happening.
One of the first things I did after getting the PC was upgrade the graphics card. I replaced the two GTX 1070s with a refurbished RTX 3060 Ti.
The computer worked perfectly fine with the 3060 Ti for around a year.
Then, about three weeks ago, everything started going wrong.
How the Problem Started
Around three weeks ago, the shroud on my RTX 3060 Ti broke. The GPU fans came loose while spinning, and I was worried they could damage something inside the PC.
I immediately removed the graphics card.
Since I still had my old GTX 1070s, I temporarily installed one of them.
I updated the NVIDIA drivers for the GTX 1070, and the computer started working normally again.
At that point, the motherboard, CPU, RAM, and power supply were still functioning well enough to run Windows.
That makes what happened next even more confusing.
I ordered a replacement shroud for my RTX 3060 Ti. Once it arrived, I repaired the graphics card and eventually reinstalled it.
After that, the PC suddenly stopped displaying anything.
The computer would turn on, all the lights would come on, and the fans would spin, but I wouldn't get any video output.
No ASUS logo, no BIOS screen, no Windows loading screen. Nothing.
Just a black screen/no signal.
I tried restarting the system multiple times, but the result was always the same.
Everything I've Already Tried
- Tested three different graphics cards
I've tried every GPU I currently own.
- RTX 3060 Ti: Fans spin smoothly, but there's no display.
- EVGA GTX 1070: Fans repeatedly jitter or twitch when turning on the PC, and there's no display.
- Other GTX 1070: Fans spin smoothly, but there's still no display.
The EVGA GTX 1070's fan behavior concerns me because it seems unusual, although I know some cards have zero-RPM fan modes.
What's especially confusing is that a GTX 1070 worked perfectly fine right before I reinstalled the repaired 3060 Ti.
Now none of the three cards produce a display.
- Reseated the graphics card
I've removed and reinstalled the GPU, making sure it was properly seated in the PCIe slot.
I also checked the GPU's PCIe power connections.
Still no display.
- Tried different display connections
I've tried HDMI and DisplayPort directly connected to the graphics cards.
Neither worked.
- Tried integrated graphics without a GPU
My Intel i7-7700K has integrated graphics, so I completely removed the dedicated GPU and connected HDMI directly to the motherboard.
I wanted to see whether the system could display anything without relying on a graphics card.
Unfortunately, there was still no display.
- Tested with one RAM stick
I removed the other RAM sticks and tried starting the PC with a single stick in the A2 slot.
For clarification, I normally use two 16GB DDR4 sticks for 32GB total.
I also own two spare 8GB sticks, but I don't run all four sticks together.
Testing with one stick didn't fix anything.
- Reset CMOS
I reset the motherboard's CMOS to restore the BIOS settings to their defaults.
Still no display.
- Completely disassembled and rebuilt the PC
I eventually got so frustrated that I decided to take the entire computer apart and rebuild it.
I removed the motherboard from the case, took out the graphics card and RAM, disconnected the CPU cooler, and unplugged the components.
I then reassembled everything and reconnected the cables.
After all that work, the exact same problem remained.
- Checked the motherboard's diagnostic LEDs
My ASUS Z270E motherboard has Q-LED diagnostic indicators for CPU, DRAM, VGA, and BOOT.
I haven't noticed any persistent error lights.
The system receives power, the lights turn on, and some fans spin, but nothing displays.
- Noticed an additional fan issue
After rebuilding the PC, some of my side case fans stopped receiving power or spinning.
They appear to be connected through a Thermaltake fan controller.
I've been reconnecting everything, and I connected one fan cable to the motherboard's H_AMP_FAN header.
I'm still not completely sure whether every connection to the controller is correct.
I'm mentioning this in case it helps identify a power issue, although it could simply be a separate wiring problem from the rebuild.
My Biggest Concern: Is the Original Hardware Finally Failing?
This is what I'm most worried about.
The motherboard, CPU, and possibly the PSU are all from a system that's nearly a decade old.
The ASUS Z270E and i7-7700K are 2017-era components, and I believe my Corsair RM750 power supply has been in the computer since the original build.
I know a PSU doesn't automatically fail after 10 years, but I'm wondering whether age and years of use could have caused it to deteriorate.
Someone on Reddit recently commented that they experienced almost the exact same symptoms with an older PC.
Their computer would turn on, the lights and fans would work, but the system wouldn't POST or display anything.
According to them, replacing the power supply completely solved the issue.
That made me consider whether my RM750 could be experiencing something similar.
The PSU is rated for 750W, which should be more than enough for this build. However, I'm wondering whether an aging PSU could still power the lights and fans while failing to deliver stable power to the rest of the system.
Unfortunately, I don't have a spare PSU available to test.
I'm also considering that the motherboard itself could have failed because of its age, although I understand that neither possibility has been proven.
My Main Suspects
- Aging or failing motherboard
The ASUS Z270E is a 2017-era board. I've tried different GPUs, integrated graphics, a single RAM stick, resetting CMOS, reseating the graphics card, and rebuilding the system.
I'm wondering whether something on the motherboard has finally failed after almost a decade.
- Aging or failing power supply
My Corsair RM750 may be one of the original components from 2016–2017.
I'm wondering whether it's delivering unstable power or has developed a fault over time.
The fact that the PC still lights up doesn't necessarily mean the PSU is healthy.
- Another hardware or connection issue
I'm also aware that the damaged 3060 Ti, GPU power connections, RAM, or something else could still be involved.
I don't want to completely rule anything out without proper testing.
Possible Upgrade if the Motherboard Is Dead
I currently have two offers available:
- B550M motherboard — $60
- Ryzen 5 5600X — $90
- Total: $150
That would be a pretty significant upgrade over my old i7-7700K platform.
However, if the actual problem is my PSU, buying those parts wouldn't solve anything.
I'm considering visiting Best Buy Geek Squad or an independent PC repair shop to see whether they can properly diagnose the system.
What I Need Help With
I'd really appreciate some advice from people who have experience troubleshooting older PCs.
My main questions are:
Considering this PC is nearly 10 years old, does this sound more like an aging motherboard or a failing PSU?
Can an old PSU provide enough power for RGB and fans while failing to POST?
Why did my computer work with a GTX 1070 before reinstalling the repaired 3060 Ti, but now refuse to display anything with three different GPUs?
Could something have failed during the GPU replacement?
Is there a reliable way to determine whether my old motherboard is dead?
Could the EVGA 1070's fan jittering be related to unstable power?
Would testing with a known-working PSU be the best next step?
Is there anything important I've missed before replacing the motherboard and CPU?
I understand that old components don't automatically fail just because of their age, but this system has been around for almost a decade, and I'm wondering whether something has finally given out.
I've already spent a lot of time disassembling, rebuilding, reseating components, resetting CMOS, testing multiple graphics cards, and checking the connections.
I'm just trying to figure out what actually failed before spending money replacing parts.
I can provide pictures or videos of the system if that helps.
Any advice would be greatly appreciated. Thanks for reading.