GPU Fans Spinning but No Display? What It Means and How to Fix It

In this guide (8 sections)

• What it means when the graphics card’s fans spin
• 1. The monitor is plugged into the wrong ports
• 2. A power cable to the card is missing or loose
• 3. The card isn’t fully in its slot
• 4. Your processor needs the graphics card, or the other way round
• 5. A BIOS setting or the monitor is getting in the way
• 6. The card is faulty
• Real cases: what other users ran into

Your graphics cardGPU (graphics card): The graphics card: the part that creates the picture you see on the monitor. More in our PC basics glossary →Close ✕’s fans are spinning, its lights may be on, but the monitor shows nothing or says “No signal”. The good news: spinning fans mean the card is getting power from the slot at least. That narrows things down a lot, and the cause is usually a cable, a setting or a missing power connection rather than a dead graphics card.

What it means when the graphics card’s fans spin

Graphics card fans can spin as soon as the card gets power from the motherboard slot. That doesn’t mean the card is working, or that the rest of the PC has finished starting. Use these clues to narrow it down:

What you see	What it suggests	Where to look
The fans spin and the card lights up, but the debug lightDebug lights: Four small lights on the motherboard (CPU, DRAM, VGA, BOOT). The one that stays on shows where startup got stuck. More in our Startup & BIOS glossary →Close ✕ VGA stays on.	The motherboard can’t use the card	Causes 2, 3 and 5
The picture works from the motherboard port, but not from the card.	The card isn’t powered or seated properly	Causes 2 and 3
There’s no picture during startup, but Windows appears later.	A setting or monitor handshake problem	Cause 5
The fans spin, but a different debug light (CPU or DRAM) stays on.	The card is fine; startup stops earlier	Debug lights guide
The card’s fans spin for a moment, then the whole PC shuts off.	A power or wiring problem	PC turns on then off

Is your problem the opposite, a card whose cooling fans don’t spin at all? That’s often normal; see our guide to a GPU fan not spinning.

1. The monitor is plugged into the wrong ports

This catches a lot of people, especially after upgrading from a PC without a graphics card. A desktop PC can have two sets of video ports: the motherboard’s, up with the USB ports, and the graphics card’s, in a horizontal row lower down. With a graphics card installed, the motherboard’s ports normally do nothing.

Where to plug in the monitor

Back of a desktop PC. With a graphics card installed, use the ports on the card.

• 1Motherboard ports (higher up)
  Usually disabled when a graphics card is installed, and useless if the CPU has no integrated graphics.
• 2Graphics card ports (the horizontal row lower down)
  Plug the monitor in here.

Fix: move the cable to one of the graphics card’s ports and restart. If your monitor has several inputs, make sure it’s set to the one you’re using.

2. A power cable to the card is missing or loose

Most graphics cards need power cables from the power supplyPSU (power supply): The power supply: the box that takes power from the wall and feeds every part through cables. More in our PC basics glossary →Close ✕, as well as the power they get from the slot. The slot alone can be enough to spin the fans and light the logo, but not to make the card work. So a card with a missing cable often looks alive but shows nothing.

How to check:

• Look along the top or end of the card for 6-pin, 8-pin or 16-pin sockets. Every one must be connected. Two sockets means two cables.
• Push each plug in until it clicks. 16-pin (12VHPWRGraphics card power cable (PCIe): The power cables that plug directly into the graphics card. Most cards need one or more, as well as the slot. More in our Power supplies & cables glossary →Close ✕ / 12V-2x6) plugs must go in fully, with no gap.
• Use separate cables from the power supply for each socket if you have them, rather than one cable split in two.
• Make sure you’re using the graphics card cables (labeled PCIe or VGA), not the CPU cable, which looks similar. Our CPU vs graphics card cable diagram shows the difference.

3. The card isn’t fully in its slot

Graphics cards are heavy and their slot is stiff. A card can look installed while one end hasn’t made full contact, especially after the PC has been moved.

Fix:

1. Switch off and unplug the PC.
2. Unscrew the card’s bracket at the back of the case, press the small latch at the end of the slot and lift the card out.
3. Push it back into the top long slot with firm, even pressure until the latch clicks, then screw the bracket back in.
4. If the card sags, a support bracket or stand helps keep it seated.

4. Your processor needs the graphics card, or the other way round

If your processorCPU (processor): The processor: the chip that does most of the computer's thinking. It sits under a cooler on the motherboard. More in our PC basics glossary →Close ✕ has no built-in graphics (many Intel “F” models and many Ryzen chips), the graphics card is the only way to get a picture. In that case a card that isn’t working will always mean a black screen, even if everything else is fine.

If your processor does have built-in graphics, you have a useful test: remove the card, plug the monitor into the motherboard and start the PC. If you get a picture, the rest of the PC is working and the problem is the card, its power or its settings.

5. A BIOS setting or the monitor is getting in the way

Sometimes the card works perfectly in Windows, but you see nothing until Windows has loaded: no logo, no BIOS screen. Or the screen flickers on and off during startup. This is usually a compatibility issue between the card, the motherboard’s BIOS and the monitor, not a fault.

Things to try:

• Toggle CSMCSM (Compatibility Support Module): A BIOS setting that makes a modern PC behave like an older one. Some graphics cards and drives need it on or off to show a picture or boot. More in our Startup & BIOS glossary →Close ✕ in the BIOS. On some combinations of card and motherboard, the startup screen only appears with CSM switched on (or off). If you can’t see the BIOS at all, use the motherboard’s own video port or an older card to get in and change it.
• Update the BIOS to the latest version from the motherboard maker.
• Update the card’s firmwareVBIOS (graphics card firmware): The small built-in program inside a graphics card. Updating it can fix compatibility problems with some motherboards. More in our Graphics cards & display glossary →Close ✕ (VBIOS) with the official tool from the card maker, if they offer one for your model.
• Test with a different cable or monitor, especially with HDMI 2.1 and high-refresh screens. Some monitors take a moment to “wake up” and miss the startup screen.

6. The card is faulty

If you’ve tried all of the above, and especially if the card shows no picture in a second PC too, it may simply be faulty. That’s more common with second-hand cards, but new cards can arrive dead too. Contact the seller or manufacturer: a card that’s new or under warranty should be replaced.

Real cases: what other users ran into

These are real reports from PC forums, summarized in our own words, with a link to each original thread.

Real caseIntel Arc A750 · Core i7-12700 · Gigabyte B760M Gaming X AXSolvedOnly one of the two power cables was connectedRead what happened

A newly installed graphics card lit up but gave no picture, and the PC kept using the processor’s built-in graphics instead. The seller had said the card only needed its 6-pin power cable. In fact it needed the 8-pin as well. Once both were connected, the card worked. The person who posted summed it up as a lesson learned.

Takeaway: every power socket on the card needs a cable. See cause 2.

Source: Intel Community

Real caseASUS ProArt RTX 4080 Super · Ryzen 7 7800X3D · ASUS B650E-I · Samsung Odyssey Neo G8SolvedNo startup screen, but Windows worked fineRead what happened

After installing a new card, there was no picture during startup or in the BIOS, and the monitor kept turning off and on, although Windows loaded normally. Keeping the monitor’s menu open during boot and switching to a better HDMI 2.1 cable helped, but didn’t fully fix it. What finally made the problem go away for good, according to the owner, was enabling CSM in the BIOS.

Takeaway: a card that works in Windows but shows no startup screen usually needs a setting changed, not replacing. See cause 5.

Source: ASUS ROG Forum

Real caseRTX 5060 · Core i5-12400F · ASUS TUF B760M-ESolution not confirmed by the userNew card, no BIOS screen with CSM offRead what happened

After upgrading from an older card, the owner got no display at first. With CSM switched off, the motherboard’s VGA light stayed on and the BIOS couldn’t be reached, even though Windows still started. Switching CSM on made the card work, but getting back into the BIOS meant temporarily refitting the old card. A forum reply suggested updating the card’s firmware with the manufacturer’s tool. The owner didn’t report back.

Takeaway: if the card works in one CSM setting but not the other, a firmware update for the card or the motherboard is the next step. See cause 5.

Source: ASUS ROG Forum

Real caseMSI RX 6600 XT (used) · Core i7-2600K · ASRock H77 Pro4/MVPSolved by replacing hardwareA second-hand card that was simply brokenRead what happened

A used graphics card gave no picture in any slot, and with it as the only card the PC switched off as soon as it was turned on. The owner tried driverDriver: The software that lets Windows talk to a piece of hardware, like the graphics card. More in our Graphics cards & display glossary →Close ✕ reinstalls, motherboard BIOS updates, different slots, cables and power connections, and even flashing the card’s firmware. When the card still showed nothing in a brand-new PC, the owner returned it to the seller.

Takeaway: if a card fails in two different PCs, it’s the card. Test before spending hours on software. See cause 6.

Source: TechPowerUp Forums

Frequently asked questions

Why do my GPU fans spin but there’s no display?

The card is getting power from the slot, which is enough to spin the fans, but something else is stopping it from sending a picture: a missing power cable, the monitor plugged into the motherboard, a card that isn’t fully seated, or a BIOS setting.

Can a GPU be dead if the fans still spin?

Yes. Spinning fans only show that the card receives some power. A faulty card can spin its cooling fans and still show nothing. Rule out cables, seating and settings first.

Does a graphics card need both power cables?

Yes. If the card has two power sockets, both need to be connected. The card may light up with one, but it won’t work properly.

Why do I see nothing until Windows loads?

That usually points to a compatibility setting, such as CSM in the BIOS, or a monitor that’s slow to detect the signal. Updating the BIOS or the card’s firmware often fixes it.