My PC wont boot

Vegetto · July 8, 2019

CPU: i5 8600k

MB: asrock z370 pro4

PSU: corsair tx650m

GPU: RTX 2070

RAM: 2x8gb HyperX fury 2666MHz

Hello,

My pc was working normally until last week. One day I was going to turn off pc, but I noticed that all fans were very loud (they were on max speed), and pc didnt shut down. I managed to turn it off using button. I didnt have time to think about it so I continued to do what I was doing. Later that day I tried to start pc but it wont boot, LAN light on motherboard is working, so PSU wasnt dead (later on I will add more on that). I tried removing PSU cable from the wall plug and switching switch on back of PSU, at first it didnt do anything, later on I came back and switched PSU switch and pressed power button and PC started booting but failed, was starting over and over again (fans start to spin and stop after few seconds). After trying it again nothing happened same as before that (nothing happening). After trying few more times I PC started booting normally booting and everything looked fine, I was relived, I thought it was maybe power problem in my house and it is fixed now. But when I clicked Shut Down PC wasnt shutting down again (fans and light to max as first time).

After that I didnt managed to turn it back on (it was back to "nothing" state).

So I said lets disassemble PC and reconnect all power connectors, maybe some were loosen up. But sadly no, all was the same.

Forgot to mention before, first time I was shutting down pc because outside I heard loud lightning strikes. (If lightning strike did hit my house what should I look for in my pc for signs of lightning damage)

I thought, since there was storm when all this happened, maybe PSU was fried or voltages were wrong.

After using paper clip to turn on PSU and multimeter to measure voltages I came to conclusion that PSU is OK. All voltages were fine (tested motherboard connector, CPU, GPU connectors).

Then I removed all components except CPU, motherboard, one RAM stick and PSU to test will it boot, but nothing happened. (even removed front panel connectors(thought maybe button was problem))

I am wondering what could it be, motherboard maybe. How to test it?

Thank you guys in advance, any suggestions are welcome.

SpookyCitrus · July 8, 2019

What is the model of PSU you have, if you didn't have it connected to a surge protector then it is possible either the motherboard or PSU were damaged, just turning it off will not prevent it from taking damage, you have to fully disconnect it from the wall or surge or surge protector to 100% keep it safe.

Vegetto · July 8, 2019

13 minutes ago, SpookyCitrus said:

What is the model of PSU you have, if you didn't have it connected to a surge protector then it is possible either the motherboard or PSU were damaged, just turning it off will not prevent it from taking damage, you have to fully disconnect it from the wall or surge or surge protector to 100% keep it safe.

Wrote up there PSU: TX-M Series™ TX650M — 650 Watt 80 Plus® Gold Certified PSU

I am sorry I forgot to mention that I dont have a surge protector. Also after I turned off pc during storm using button I fully disconnected it from the wall. If fans working on max isnt sigh of that kind of damage, then lighting strike shouldnt be the reason. (Only first part (first shut down) was during the storm)

If you think it is lighting what should I look for since PSU seems OK?

SpookyCitrus · July 8, 2019

17 minutes ago, Vegetto said:

Wrote up there PSU: TX-M Series™ TX650M — 650 Watt 80 Plus® Gold Certified PSU

I am sorry I forgot to mention that I dont have a surge protector. Also after I turned off pc during storm using button I fully disconnected it from the wall. If fans working on max isnt sigh of that kind of damage, then lighting strike shouldnt be the reason. (Only first part (first shut down) was during the storm)

If you think it is lighting what should I look for since PSU seems OK?

Really I think you only have one option and that's to try another PSU, you already did most of the standard trouble shooting, it's down to if it's the PSU or the motherboard now. If you have already fully taken it apart, like removing everything CPU and Ram included and put it all back together then it's probably not a connection issue. Just as an extra step before trying a different PSU I would remove one of ram modules and see if it posts with just one and make sure to alternate and try both modules separately to test if it's a ram problem, if it still has the same issue with both ram modules then I would try a different PSU.