Question PC turns on and fans on, but won’t post CPU debug light one

[Roadto520]

About a year ago, my pc crashed while playing halo and wouldn’t post after I restarted. CPU debug light was stuck on and no peripherals or monitor would turn on. I wasn’t able to deal with it at the time and didn’t touch it for this past year except to check it every couple months. Yesterday, I powered it on and it booted like nothing ever happened and I was able to play games on it the whole day. Looking back in hindsight, I should have tried to diagnose the problem while it was booted but assumed it might’ve fixed itself. Well this morning I went to boot it up and the same issue occurred, pc turns on but no post and CPU light on. If it didn’t post yesterday and work completely normally I would’ve chalked it up as a loss and looked at a new rig but I now know it can work perfectly fine if it can post. I have tried resetting and shorting CMOS, reseating the CPU and gpu connectors and the RAM with no effect. Does anyone know how I can get it to post since I know it clearly can work ok if it does?

CPU- i5-6600k
Mobo - MSI Z170 Krait
RAM - Corsair vengeance 2x8gb 3000 DDR4
GPU - Msi 1070 quicksilver
PSU - 750W Corsair
Storage - 240gb Kingston SSD + 1tb WD Blue

 

[JohnBonhamsGhost]

PSU - 750W Corsair

what model and how long has it been in use?
not how long you may have owned it but an estimate of how long it was actually in use.

tried resetting and shorting CMOS, reseating the CPU and gpu connectors and the RAM with no effect

try using only CPU's iGPU, remove GTX 1070 altogether.

try each stick of RAM separately,
and if still no response try each DIMM slot separately.

when reseating the CPU did you check the interface for any damage; bent pins, scorching, chips in the material, etc?

 

[Roadto520]

what model and how long has it been in use?
not how long you may have owned it but an estimate of how long it was actually in use.

try using only CPU's iGPU, remove GTX 1070 altogether.

try each stick of RAM separately,
and if still no response try each DIMM slot separately.

when reseating the CPU did you check the interface for any damage; bent pins, scorching, chips in the material, etc?

I was incorrect actually. It is an EVGA 750W G2 Supernova. In use since 2017, moderate gaming use until 2022 probably 3 days a week. No CPU damage or bent pins were noticed. Removing the gpu did not have an effect and neither did moving the RAM around. I could see how it may be a PSU issue, but I'm just confused on why it decided to work yesterday after like half a year without being started.

 

[JohnBonhamsGhost]

the G2 series were mostly pretty reliable.
doubt yours is the cause of this issue, but some bad apples always manage to get out there.

i would guess it is either an issue with the motherboard or the CPU just being faulty.

what have you been using for your computing needs since this system failed?
if you have a spare system around;
try swapping out what you can one component at a time and see if you find any specific that causes issue with the secondary system.

you can also take it to a local computer shop and have them test each component one at a time.

 

[Roadto520]

the G2 series were mostly pretty reliable.
doubt yours is the cause of this issue, but some bad apples always manage to get out there.

i would guess it is either an issue with the motherboard or the CPU just being faulty.

what have you been using for your computing needs since this system failed?
if you have a spare system around;
try swapping out what you can one component at a time and see if you find any specific that causes issue with the secondary system.

you can also take it to a local computer shop and have them test each component one at a time.

I'll likely take it to a shop since I don't have a secondary system ready to go. Annoyed at myself as I didn't investigate when it was working yesterday, but can't figure out for the life of me how to replicate that without letting it sit unplugged for a couple months lol