Question Tried replacing my CPU cooler, now PC turns off after half a second.

Nov 28, 2024
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I tried installing the Peerless Silent Assassin on my PC bc I got thermal throttling with my built in AIO cooler.

It was a Lenovo T7 prebuilt, MoBo is a Lenovo 3715, LGA 1200 chipset. Should be compatible.

But I must have fucked something up because now that I installed the thing it no longer turns on for longer than 1 sec.

I have removed the CPU and it will run just fine without the CPU installed but I am not a tech guy so idk what that means/if it means anything.

I put on way too much thermal paste and apparently I got some in between the CPU and the socket (I think)

I don't think any pins are bent but I can't see them very well. They look straight when looking at them. I have cleaned the socket and the CPU plates with 99.9% alcohol and a very soft clean paintbrush.

As soon as I put the CPU back into the socket - cooler or not - the PC will turn on for one second and then off again. Idk why.

I have tried everything I can think of:

Remounted the Cooler and plugged in only one fan into CPU fan.

Remounted the Cooler and plugged in fans into CPU pump.

Remounted the Cooler and plugged the AIO pump back in (it has a 3 pin connector so I figured maybe that is it)

Remounted the Cooler and plugged the pump in and every other fan.

Remounted the Cooler and plugged in the RGB of the pump and every other fan.

Remounted the Cooler and plugged in fans into the CPU fan and CPU pump only.

Remounted the cooler and plugged out everything - fans, RGBs, GPU.

Dismounted the cooler and did all of the above.

Reset the CMOS battery.

Replaced the CMOS battery.

Left the CMOS battery out for 5 mins.

Put the cooler on tighter.

Put the cooler on lighter.

Reseated RAM twice.

Tried booting with only one stick of RAM.

Tried booting with the CPU removed but the latch closed (it ran fine)


Idk what else to do at this point or what to replace. Did I fuck my CPU by screwing on the cooler too tight at some point? I read that is pretty hard to do.

Did I fuck up my socket? The CPU fit in very nice when I reseated it (I did that twice) and the pins look good to me.

My local tech shop is currently not sure if he even wants to take my case (lol). So I am on my own. Money is a bit tight so I dont wanna pay $120+ for a new MoBo if I dont have to. Nothing on my MoBo lights up to indicate any faults...

What I find odd is the fact that this only happens when the CPU is in the socket. When no CPU is in the socket it will run for more than the one second.