A New PC Just Powered On, Now Shows It's Not Working.
A New PC Just Powered On, Now Shows It's Not Working.
I assembled a brand new PC for a family member, and I've constructed a few units before, most recently a gaming PC just now.
I'm quite puzzled about this situation:
When I first attempted to power the device, it appeared to be constantly cycling—fans spinning up and down repeatedly, and error indicators flashing on the motherboard (ASROCK B550M PRO4 Micro-ATX). There was no display or any other output. I didn’t recall turning it off before leaving. Later, when I returned to check the error lights on the MOBO, everything seemed normal.
However, when I tried to boot up the BIOS, it reported that the CPU was running excessively hot. Since this machine is mainly intended for word processing and browsing the internet, I initially used the standard heatsink/fan but eventually replaced it with a CoolerMaster 212 after carefully cleaning the old paste.
This evening I attempted to turn it on again—result? It’s completely unresponsive. There’s no power indicator, no error lights, no fans at all. It seems as though it might not even be connected. I verified all connections and even changed the power outlet, but nothing changed.
My only conclusion is that the CPU likely didn’t properly engage during installation, possibly due to the unusual cycling behavior. I suspect this could be related to the MOBO or the PSU (BeQuiet Gold 650W). If it were a CPU issue (Ryzen 5/5500G), wouldn’t it at least attempt to activate?
reset the system by jumper while unplugged from the wall
loosen the heat sink slightly and attempt to power it on
remove all cooler components completely and briefly test for activation
inspect the CPU socket pins for any bending or discoloration
record the temperature before entering BIOS
use a paper clip test to check the PSU functionality
run hardware diagnostics with minimal settings: one RAM, motherboard, PSU, monitor, keyboard, CPU with standard cooler and fan