Question New PC won't boot (possible VGA problem?)

[adarisbo]

Hey everyone.

I've recently changed the Mobo and RAMs of my main computer. Everything went fine. However, after installing the old parts on my mother's computer, her PC won't boot. All the components light up and the CPU sounds like it's working, but nothings appears on her monitor. There are no beeps on the speaker either. The only thing that could indicate a problem are the lights inside the Mobo. According to them, CPU and RAM are fine but the VGA light is red and apprently that's keeping the system from fully booting.

Seems like an easy problem to solve, right? Get a new GPU. I bought a new budget one and the same problem persists. The new processor I bought for her computer is the same model I was using with that Mobo before (i5-12400F). Unfortunartely it has no graphics built in so I can't use the Mobo's HDMI output.

I have tried all the checklists and nothing seems to work. Any help would be really appreaciated.

CPU: I5-12400F
Mobo: B660 DS3H DDR4
RAM: 2x8GB Corsair Pro
GPU: Revenger GTX 550Ti (also tested with Zotac GT520)

 

[Lutfij]

CPU: I5-12400F
Mobo: B660 DS3H DDR4
RAM: 2x8GB Corsair Pro
GPU: Revenger GTX 550Ti (also tested with Zotac GT520)
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.

I've recently changed the Mobo and RAMs of my main computer.
You've mentioned swapping out the motherboard and CPU, what were you on prior to the swap?