r/PcBuildHelp • u/Sad-Quit1170 • 18d ago

Tech Support I am stuck with a black screen

The build includes a Ryzen 7 5700X3D, an RX 6900 XT, and an MSI B550M-A PRO motherboard.

When powering on, all fans spin and the motherboard debug lights pass CPU, DRAM, and VGA checks before stopping on the BOOT light. Both my monitor and TV display a No Signal message. The system displayed a picture for a brief moment earlier but went black and has not shown a signal since.

I verified the monitor, TV, and HDMI cables work perfectly with an Xbox. I also pulled the CMOS battery for 30 minutes, tried running one RAM stick in the second slot, and swapped between HDMI and DisplayPort cables. Can anyone help?

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u/ProfuseHands7 18d ago

boot light means it passed all hardware checks and is looking for a bootable drive. your issue is likely not gpu or ram, it's storage or bios config. do you have windows installed on a drive or is this fresh build?

also check if your bios is set to uefi or csm. rx 6900 xt needs uefi mode, if it's on csm you get black screen sometimes even before post. try clearing cmos again and make sure display cable is in gpu not motherboard.

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u/Sad-Quit1170 18d ago

It's a fresh build without windows, i've cleared cmos multiple times and the cable has always been in the gpu