PC doesn't turn on. Psu fan spins for half second than dies

Karmak83 · Apr 12, 2015

Hi guys!
So, some time ago I've got this random shut down of my pc. Some times I could use it for hours without problems and other times I couldn't even turn it on that it was already off again (only unplugging the psu and wait some time would do it). After much trial and error I found out that slightly touching the PCI-e cable (on the psu end) would turn the pc so I got a new psu. After installing it I had the computer running for some hours and then off again. From that moment I'm not able to turn it on anymore. I have the fan of the psu that spins for half a second and than dies. All the lights on the mobo are on. I tried to unplug everything and jut connect psu mobo and ram and still nothing. Is the mobo dead? Could be the CPU?

Mobo asus maximus v gene
Psu was corsair ax750 now is a seasonic m2i
Ram is corsair vengeance 2x4gb
CPU i5

Thanks a lot

alexoiu · Apr 13, 2015

Hi, Try testing the power supply: https://www.youtube.com/watch?v=5FWXgQSokF4
See if a connected fan does spin.

Karmak83 · Apr 13, 2015

I did the test and the psu is working. Is my mobo dead?

alexoiu · Apr 13, 2015

If starting the board with only CPU and CPU fan installed is it the same? If yes, then it might be a board or CPU issue., or... both.

Karmak83 · Apr 18, 2015

Hi, sorry has been awhile.
So since just starting the pc with only psu, CPU and mobo didn't work (tried with or without CPU fan on and I did the psu test with the paperclip and it works) I bought a new mobo and a new CPU (lga 1150 this time, before I had 1155) but is the same story. Turns on for a split of a second and then off. I checked again all the cables and with new ram sticks. What's going on?

alexoiu · Apr 18, 2015

Can you post a picture with the board outside the case, only CPU and CPU fan installed, both 24 and 8 pin power cables connected?

Karmak83 · Apr 18, 2015

http://imgur.com/CZ95bSp

alexoiu · Apr 18, 2015

Try removing the Corsair cooler and install the stock Intel one. Start the board and see if the CPU fan does spin or not.

alexoiu · Apr 18, 2015

And RAMs removed too.

Karmak83 · Apr 18, 2015

With the stock cooler and no ram, same thing. Psu and cooler fans spin for half second. All the lights on the mobo are on

alexoiu · Apr 18, 2015

Then either the CPU, or the power supply. Try borrowing a power supply and testing.

Karmak83 · Apr 18, 2015

Could be that the bios version that is flashed in the mobo doesn't support my CPU?

aquaprofile · Apr 18, 2015

Karmak83 :

I think I had this same issue with my Mobo. Get a case fan. Plug it into CPU fan header. Plug the corsair cooler into any fan header. make sure all cables are plugged in correctly. plug the corsair cooler into the Molex so it can pump. Hdd is in, GPU is in and plugged in and try to boot.

Karmak83 · Apr 18, 2015

Still no luck

aquaprofile · Apr 18, 2015

Karmak83 :

Have you tested your power supply? and do you have enough watts to handle everything?

Karmak83 · Apr 18, 2015

It's a new psu but I did the test with paper clip and a fan (and with corsair pump aswell)and it works. It's just weird that I have the same problems with 2 mobo and 2 CPUs. Can't be casual. My be a problem with the 20pins connector? Even if with the paper clip works?

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