BIOS Primary Display Setting PEG or IGFX Which One to Choose
Deep in the BIOS sits one setting that decides which graphics chip speaks first: Primary Display. Pick wrong and a healthy PC boots to a black screen. Here is what PEG, IGFX and Auto actually mean.
By Technical AnshuWindows PC HardwareBIOS and Display Fix
Watch the full fix in the video - GPU installed, no display from motherboard, solved step by step
When two graphics chips exist in one PC - the CPU's integrated GPU and your add-in card - the BIOS must choose which one shows the boot screens and hands over to Windows. That choice is the Primary Display setting, and after a GPU upgrade it is worth understanding properly instead of changing it by luck.
Initial Display OutputSame idea, other brands' wording
The same setting under different names across board brands - example wording, check your manual
1
What the Names Mean
PEG stands for PCI Express Graphics - your add-in card in the PCIe slot.
PCIe / PCI Express / dGPU - other brands' words for the same thing: the card.
IGFX / Internal Graphics / iGPU / Onboard - the graphics built into the CPU, feeding the motherboard ports.
Auto - the BIOS decides, and its rule is simple: if a card is present, the card wins.
Honest warning: menu names and locations are not standardised. ASUS, Gigabyte, MSI and ASRock all label this differently, and it may hide under Advanced, Chipset, Peripherals or Settings. Your motherboard manual is the authority - search its PDF for Primary Display or Initial Display.
2
Which One Should You Choose
You game or do graphics work on the card: leave it on Auto, or set PEG/PCIe explicitly. The card drives everything - simplest and fastest.
You need the motherboard port working too: set Primary Display to the card, then separately enable the iGPU multi-monitor option if your BIOS offers one. Primary choice alone does not keep the iGPU alive on most boards.
You are removing the card: set it back to Auto or IGFX before taking the card out, or plug the monitor into the card until the switch is done - otherwise you can lock yourself out of the picture entirely.
Troubleshooting a black screen: Auto is the safest reset position. Change one thing at a time and note what you changed.
3
Two Things This Setting Cannot Do
First, it cannot create an iGPU that does not exist - if your CPU has no integrated graphics, IGFX is an empty choice and the motherboard port stays dead whatever you select. Second, on many boards choosing IGFX as primary still does not stop the BIOS from disabling the iGPU when a card is installed; keeping both alive needs the separate multi-monitor option. Read the next guides in this set for those two cases, and do not flash a BIOS update chasing this setting - that is risk without benefit here.
Watch the Complete Fix in the Video
The video walks through the display problem start to finish - pair it with this BIOS setting guide for the full picture.
I set Primary Display to IGFX but the motherboard port is still black. Why?
On most boards the iGPU is disabled completely when a card is present, regardless of the primary choice. Keeping it alive requires a separate option usually called iGPU Multi-Monitor or Internal Graphics set to Enabled. If your BIOS has neither, the board cannot run both outputs together.
Will setting PEG instead of Auto make my games faster?
No. Auto already picks the card when one is installed, so performance is identical. The setting only decides which output shows the picture - it does not change the card's speed, power or Windows driver behaviour in any way.
I changed the setting and now I get no picture anywhere. How do I recover?
Plug the monitor into the graphics card - the output almost certainly moved there. If truly nothing shows on either, power off, remove the card, and the iGPU (if your CPU has one) should take over so you can re-enter BIOS and undo the change. Change one setting at a time next round.
This guide is based on the Technical Anshu video on the GPU no-display problem - if a step gets stuck, ask in the video comments and you will get an answer.