No Monitor Signal After Windows 11 Update and Shutdown on a New PC

Start with a complete power reset. Shut down the PC, unplug the power cables from both the computer and monitor, and wait about 10 seconds. Make sure the HDMI or DisplayPort cable is firmly connected at both ends, then reconnect everything. Turn the monitor on first and the PC second. If possible, try another video cable, a different port on the monitor, and another port on the graphics card. You should normally see a manufacturer logo or BIOS screen before Windows loads. If there is still no image and the keyboard lights do not respond, the computer may not be completing its startup process, so using the warranty or returning it is reasonable for a brand-new system.

The Caps Lock and Num Lock test is useful: if neither keyboard light changes, the PC may not have reached Windows at all. That makes suggestions like updating or reinstalling a graphics driver impractical because you cannot see the screen. First check that the computer itself is powered on and that any diagnostic lights or beep codes are not indicating a hardware problem. Avoid changing BIOS or disk settings while troubleshooting. Since the machine is new, document what happens during startup and contact the retailer if a full power reset and cable check do not restore the display.

Check where the monitor cable is plugged in. If the PC has a dedicated graphics card, the cable usually needs to be connected to the graphics card’s ports lower down on the back of the case, not the motherboard’s video output near the USB ports. You can also try the motherboard video output temporarily if the processor supports integrated graphics, but that may not work on every model. Since this happened immediately after an update and shutdown, a graphics driver problem is possible, although the lack of keyboard-light response suggests it may be more than just a Windows driver issue.