Question PC power cycling on and off but won't turn on

db003

Distinguished
Apr 24, 2013
41
0
18,530
pc was working fine when i left but came home and it was just power cycling on and off constantly and won't turn on. I tried disconnecting my gpu. I tried moving the ram to another slot and also tried with just one stick in different sslots. I also tried to reset and replace the cmos battery.

when the pc cycles on and off the tiny red cpu light flashes for a split second on the motherboard but not sure what that means if anything. I went to best buy and picked up a corsair RM750e to see if it was the psu and it does the same thing as the one that was in there now so I dont think it is that.

I took off the cpu cooler and cleaned off the thermal paste from the cooler and the cpu and and took out the cpu and put it back in and reapplied
thermal paste still nothing

me and a buddy built my pc last year and everything has been working great till now. its like it wants to turn on. the fan spin for a second and it turns off then tries to turn on over and over.

specs that I can remember
i7 cpu 12th gen
deepcool ak620 cpu cooler
asus tuf z690 motherboard
T-FORCE VULCAN Z 16x2 32gb sure about the brand it might be 16gb
seasonic gx 850 psu
evga 3080 ftw3
all the parts were new except for the psu

so far I think I tried everything I can think of not sure what to do other then trying to rma the cpu and mother board they bough were bought at micro center.
 
so far I think I tried everything I can think of not sure what to do other then trying to rma the cpu and mother board they bough were bought at micro center.
Note - when you replace modular PSU, you also have to replace all modular PSU cables.
Modular PSU cables are not compatible between different PSU models.
Using wrong cables can damage/kill your components.

Do bread-boarding.

Assemble pc outside pc case.
Connect only essentials.
motherboard,
psu with 24pin /8pin/4pin power connectors,
cpu and cpu cooler/fan,
single ram module,
pc beeper.
CPU must have iGPU. If it doesn't have it, then connect discrete gpu also.
(No front panel connectors - USB, AUDIO, no additional fans, no HDDs/SSDs)

Try to start your pc by shorting power button pins on motherboard.
 
  • Like
Reactions: db003