Installed new fan, PC powers down. (Amateur warning)

Nov 13, 2018
16
2
515
Issue: Old fan quit, so I bought and installed a replacement. PC now boots all the way to the desktop, but shuts down after just a few minutes. Fan spins and everything looks & sounds normal up until that point.

Specific specs unknown, it is a standard Acer All-in-one, running Windows 10, with a Radeon 6550? graphics card. Old fan was a Coolmaster, new one is a Thermaltake.

As far as I can tell (and I'm barely computer literate) it may be an incompatible fan? The computer has a 4 pin male slot, but the fan's female end is only 3. Looking online for adaptors showed only 3 pin to MASSIVE 4 pins. This pc and fan both have plugs about 1/2 inch across with tiny pins, but every 4 pin I see on Amazon is 1 inch with pins at least 1/4 inch each. As ill-advised as it probably was, the 3 pin female fit over the 4 pin male comfortably, and runs perfectly for a time. Old fan was a 4 pin, in the same tiny 1/2 inch size (pins are like pencil lead thin).

Honestly, if this thing can be salvaged, great, but I know it's more than ready to replaced. There are some files I'd like to retrieve off it though, and I don't know how to do that with it in its current state. I am probably going to order another fan, but most do not show the end of the plug and do not mention it in the description. :(

A little background: I bought an Acer All-in-one about 5 years ago, because the price was right and my old pc badly needed replacing (it was like 10 yo and wearing out). This was obviously a poor choice, but I learned to deal with it. I live in this weird middle area where the idea of meddling with internal hardware is terrifying, but people keep telling me that some parts are just plug & play!, assuming you don't straight up visibly break something.

So far, this awful machine has been successfully "upgraded" by myself, by installing a new graphics card & plugging a hd tv directly into that. Drivers and such are no problem! Had to be done this way though, because after taking it to "professionals" who opened the case with pliers after watching a youtube how-to video and still kept it for a week after, told me there wasn't room and they couldn't modify the case to accommodate one for me, but I could always take it home and go at it with a Dremel! That'll be $50 now, for all the nothing we did! It is a nightmare to convince anyone to even look at an aio, so I didn't want to take it in for something supposedly as simple as a fan replacement (and be charged $50-100, depending on if they even did it or gave up.

ALTERNATIVELY, if there is a way for me to retrieve the files without fixing the fan or taking it to someone, I'd be happy with that, too.
 

Dugimodo

Distinguished
Using a 3 pin fan on a 4 pin header is fine, all you lose is the ability to speed control the fan and on some boards not even that. It should not be causing your PC to shut down.

Is this a case fan or a CPU fan?
It's possible something is overheating, try running open hardware monitor and see what the Temperatures are like, particularly for the CPU.

And it could be a coincidence about the fan and nothing to do with your other issues.
 
Nov 13, 2018
16
2
515
" try running open hardware monitor "
Not really an option... The computer shuts down in seconds if I try to run anything. It only stays on for a few minutes if I leave everything untouched.

It is the case fan.
Also, no coincidence. The fan was physically broken and the pc continued to run fine as long as it was connected (and grinding itself to pieces). I ordered a 4 pin fan that should be here by Friday, so will update on that when it arrives.
 

Dugimodo

Distinguished
Can you get into the BIOS and check the temperatures from there?
I still have trouble believing the fan causes the shutdowns, normally it'll prevent startup altogether if the BIOS has a problem with it.

If you have a minimum fan speed warning setting in the BIOS you could try lowering it or even tell the motherboard not to monitor the case fan speed.
Good luck with the 4 pin fan.
 
Nov 13, 2018
16
2
515
No idea how to do that... but yeah, you're onto why I asked.
Everything I ran into online says it should have failed sooner, never made it to desktop, etc.
I'd look into fiddling with BIOS, but UPS picked up the 3 pin return this morning, so I'm still just waiting on the 4 pin. Fingers crossed!
 
Nov 13, 2018
16
2
515
4 pin fan arrived & installed. Same issue.
Tried to reboot in Safe Mode, but PC shuts off during boot after about the same time (1 or 2 minutes).
Tried again and it seems like the up time is getting shorter.

Checked all connections, thermal paste, contacts, power cables... Everything looks good.
I wanted to disable some start up processes to help it along (takes at least a minute to reach desktop, and another to finish loading my calendar widget, antivirus, etc) but there isn't time to get into the task manager before shut down.
 
Nov 13, 2018
16
2
515
The latest startup booted to a troubleshooter I've never seen before.
It couldn't repair whatever issue it found (the was no details, advanced, more, etc) but had an option to start anyway. This time I just got to see the desktop for a second before shut down.

If this truly is a coincidence with the fan, it was VERY specifically timed.
So much so, that I must have screwed something up myself somehow.

Steps, as far as I recall:
Fan making mechanical grinding sound (computer 100% fine)
Power down pc, clean fan with compressed air, restart pc.
Fan fine for a few hours, pc still normal, grinding returns.
Repeat above, but remove* & open fan, revealing snapped internal wire.
(*unscrewed cooler/fan, disconnected pin cable, removed from pc case, opened fan access disc.)
Ordered new (3 pin) fan. Installed fan (screwed in place & plugged in).
Fan spins & pc boots, appears fine for several minutes, shuts down when attempting to open browser.
Restart & wait, pc shuts down with no warning, untouched.
Notice pin mismatch, return and order 4 pin fan.
Repeat install & shut down issue.
 

Dugimodo

Distinguished
To get into the BIOS there will be a key you need to push when first starting up, usually del or F2 but varies by manufacturer.
Once in there you should be able to find a status page or similar that shows fan speeds and temperatures. At that point the CPU should be reading quite low, maybe 20-40 celcius

What windows version? it's probably worth starting in safe mode to see if that keeps running unfortunately that may not be easy in windows 8 or 10 https://support.eset.com/kb2268/?locale=en_US&viewlocale=en_US

And next question, are you sure it was the fan making the noise? sound can be misleading.
 
Nov 13, 2018
16
2
515
Thanks for all the help so far Dugimodo, but I've already done/answered all of that.
Apparently I was using BIOS already and just didn't know what it was called!
Will check for a status somewhere in the morning. Again, the troubleshooter did detect an error on the latest run, but did not say what it was, so wasn't much help there.

Running Windows 10, as stated in the first post. Safe Mode still crashed, twice.
Absolutely was the fan. It is a very distinct sound, easily found & temporarily fixed with initial cleaning, and given that there are no other moving parts beyond the 2 fans, yes I am sure. :)
 
Nov 13, 2018
16
2
515
Well, never was able to solve the problem, so got a new pc during black friday.

Will be ordering a set of cables later that should let me plug the old hdd in via usb to recover my files... wish me luck!

Next goal is to close or delete this thread...
Consider it abandoned if I don't manage that the same date this was posted. orz