PC boots up for 3 seconds and shuts off after mainboard
disassemble
Posted by Apart_Beginning6826@reddit | buildapc | View on Reddit | 10 comments
I wanted to change my cooler so I needed a new backplate. I had to remove the motherboard and build it again. After I did that my PC was not booting up, but rather it starts to boot up for 3 seconds and it shuts itself off. The power button does not seem to work. The thing is one time i did get it to boot up and I even played games, did benchmarks etc. After that I had the same problem again. I literally tried everything, from building everything again, to removing the battery of the mainboard and changing the cpu thermalpaste. Nothing seems to work. If it helps in any way I have a Lenovo Ideacenter T540-15AMA G Desktop.
ATFGunr@reddit
When my PC did the is it ended up being a bad pump on my AIO. The emergency overheat kicks in pretty quickly. Your issue could be lots of things, but it’s worth double checking the cooler is connected properly and working (even if air cooled)
Apart_Beginning6826@reddit (OP)
yes definitely. But first of all its a new one. Second of all, I was just using the pc a while ago. Does not make sense that now it does not work all of a sudden. Must be a cable or something that does not sit right, although i removed and plugged all cables carefully like 5 times
Flimsy-Panda8000@reddit
Are you sure that you installed the new cooler correctly, including peeling off the protective film? (Did the benchmarks give you a temperature reading?)
Apart_Beginning6826@reddit (OP)
Yes I did everything correctly. The temps of the cpu were in norm. Absolutely no issues while I was using the pc, even while gaming.
Validd__@reddit
OK, ignore everything. I just said I didn’t know. That it was a reoccurring problem. I thought the first time it tried on for three seconds then it just wouldn’t turn on again, but if it keeps doing that, and sometimes turns on, then it’s most likely not a problem with the power supply and it’s probably short-circuiting. I’m pretty sure the backplate is touching something it shouldn’t
Validd__@reddit
I can’t really elaborate further since I haven’t had this problem, but this seems to be the main suspect at least in my opinion
Apart_Beginning6826@reddit (OP)
I thank you a lot. I will try it
Validd__@reddit
There’s probably better people to give advice(I’m not the best at this) but I’d recommend testing your power supply to rule that out because when I had an issue with my PC not turning on, I thought it was because of something completely unrelated I did but it turns out my power supply just happened to die in that moment, coincidentally.
Apart_Beginning6826@reddit (OP)
I appreciate your reply. How do I test that the right way?
Validd__@reddit
You could do the paper clip test, which is generally safe. It just looks risky. Or you could go above and beyond and get an actual power supply tester from Amazon. But anyways with the paper clip test is you technically and you have to be careful you put the paper clip into the specific pins. I recommend you search up a YouTube tutorial or maybe even multiple just to make sure you do it right. But what I know is if your fans spin your power supply might not have anything wrong with it keyword might. What specific power supply do you have? And once again if you don’t trust yourself to do with the paper clip test you could just get a power supply tester.