Question PC running but no monitor

Jarm__

Distinguished
Jan 7, 2017
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My brother has a computer, when he turns it on the monitor has no screen, the keyboard and mouse doesn't light up either, power button doesn't respond unless He turn off the PSU at the back with the switch. Thus he thought his motherboard went defect, so he bought a new Motherboard, CPU, the computer worked for a few days then same issue persists, he currently bought a new GPU because he put his 980TI in my computer and the same issue happened which led him to buying a new GPU... he has tried with a my PSU that is guaranteed working, he has tried reseating everything cable, reapply the CPU and changing RAMs with different working RAMs. Till the point we stumbled that we have no clue what the issue is. If anyone has a slight idea what the problem is then that would be very appreciated!

His specs:
Gigabyte B550m AHC3 1.5 REV Motherboard
Ryzen 5 5600x
16GB (2x8) RAM G.Skill Aegis DDR4 3200MHz
RTX 3060TI
Corsair RM750 Gold 80+ PSU
Samsung 990 EVO M.2 1TB SSD
 
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Lutfij

Titan
Moderator
His specs:
Gigabyte B550m AHC3 1.5 REV Motherboard
Ryzen 5 5600x
16GB (2x8) RAM G.Skill Aegis DDR4 3200MHz
RTX 3060TI
Corsair RM750 Gold 80+ PSU
Samsung 990 EVO M.2 1TB SSD

What was the make and model of the PSU that you allowed him to use/power the GPU? Pardon me for being confused but you should've mentioned your specs to the build with a before and after so we knew what they were and in hopes of narrowing down your culprit. If the PSU is used, how old is the unit?

The new motherboard is the one listed in the specs?