Gigabyte RTX 4080 experiences intermittent "no signal" issues post-shutdown when attempting to boot the system.
Gigabyte RTX 4080 experiences intermittent "no signal" issues post-shutdown when attempting to boot the system.
Hey, everyone, I’ve got a strange situation on my hands. Used to believe PCs were simple, but lately things have changed. Specs: CPU – Intel i9-12900K, GPU – GIGABYTE AERO RTX 4080 with 16GB RAM (triple support installed in case, ROG sag stand included, plus the standard GIGABYTE bracket). Motherboard – ASUS Z690 EVA Evangelion Edition. RAM – G.Skill 64GB DDR5 6400. Cooler – MSI MEG S360 AIO. Storage – two 980 Pro 500GB drives and two 980 Pro 1TB drives. Fans – three Corsair QL140 and three QL120, plus a Lian Li Strimer fan (only SATA power). PSU – Phanteks NV7 black, CoolerMaster SFX 850W.
Problem: After shutting down, when I turn it back on, my monitor shows NO SIGNAL. It boots into Windows but never displays anything. Once it hits Windows, apps load and RGB changes colors fine. The whole time I see “NO SIGNAL” before sleep.
What I know:
- It happens with two different monitors – I’ve tried both LG Ultragear+ 45 and a portable 4K HDMI.
- I use a display port cable; other DP ports (three total) on GPU work, plus HDMI (new).
- If I connect an HDMI from my motherboard to the monitor, it shows my desktop and works perfectly.
- When GPU is active, RGB turns on and fans spin. If I gently move the GPU up and down after loosening supports, picture stays clear.
- I’ve tested a riser cable from my second PCI-E lane – still no signal.
- Plugging in an HDMI from my motherboard (Intel) gives full display.
- When working, everything is fine; no artifacts, even at 200+ FPS on MW2 maxed.
- It keeps working all day. Sometimes it just disappears in the morning.
- I tried a second 12VHPWR cable from my roommate’s 4090 (4→1), but that helped yesterday only.
- Motherboard BIOS is up-to-date; I haven’t used the NVIDIA firmware update for UEFI yet, since I don’t see any display in there.
- I heard it could brick the GPU, so I’m cautious.
- This issue started after switching from a Lian Li o11 Dynamic Snow White mini to Phanteks NV7.
No visible damage on the GPU; it’s been working since the beginning. Both GPU and motherboard are covered under warranty until around December 2025. But I’ve heard ASUS warranty support can be tricky.
I recently added a CableMod ModMesh 12VHPWR extension cable (3-into-1) for each PSU rail. So far, no problem, though I restarted three times. If the issue continues, I’ll try it again.
My main question: Should I suspect the PCI-E slot or the GPU? Or could it be something else entirely? I’m really unsure what to do next.
1. Attempt DDU and reinstall the driver.
2. Dust could have entered the PCIe slot during GPU installation; reinsert it carefully and use compressed air to clean. DO NOT blow using your mouth or nose.
3. In BIOS, configure the PCIe mode for the GPU slot (typically x16 1).