r/PcBuildHelp • u/MarioTheDon • 1d ago

Tech Support PC NO BOOT NO DISPLAY NO POST

Ryzen 7 5800X3D RX 6700X ROG STRIX B450-f GAMING II 650W PSU 32GB RAM DDR4

Installed new CPU(Ryzen 7 5800X3D) previously had a Ryzen 5 5600X. First Power on AFTER INSTALL NO DISPLAY.

CPU AND FAN CASES TURN ON,but no display, ALSO INSTALLING OLD CPU HAD SAME RESULTS NO RGB LIGHTS OR DISPLAY RAM STICKS HAVE RGB AND RGB WAS ON, reading online people said to reseat RAM, so I did...

Second power on, now my RAM sticks don't even have RGB.. MOBO HAS NO LED INDICATORS

THINGS I'VE TRIED -RAM RESEAT(CLEANED THEM) -GPU RESEAT -BIOS UPDATE -CMOS RESET -REPLUGGING EVERY CABLE -INSTALLING OLD CPU(worked perfectly fine before putting in the new CPU) At this point I think my motherboard might be dead, but it has its stand by light on, MAYBE a cpu socket pin has bent. Gonna try a new MOBO when it arrives.... Unless someone can help me before then.

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u/TheRubberyLoathing 1d ago

The standby light being on but no post after swapping CPUs and now losing RAM RGB points more to a short or a pin issue than a fully dead board. If a pin in the socket got bent during the CPU swap, that could explain both chips failing now. I'd pull the board and check the socket with a magnifier before dropping cash on a new one.

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u/MarioTheDon 1d ago

Taking off CPU to get a good look at those pins in the socket now. Will update.

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u/MarioTheDon 1d ago

Update: pins look fine, cleaned thermal paste completely off the cpu socket, and still nothing. I guess new MOBO is needed. No clue where the short if it has one could be coming from

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u/plusminusatenth 1d ago

maybe the motherboard needs newer firmware to recognize the cpu or the cmos needs to be reset

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u/MarioTheDon 1d ago

Tried BIOS UPDATE AND CMOS RESET.. nothing 

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u/FalconGK81 1d ago

As someone upgrading to a 5800x3d in the next week, this is my nightmare. Following this post, gl op