After a manual restart, PC shuts down unexpectedly

Sam Shoo

Reputable
Apr 22, 2015
2
0
4,510
Hello,

I have a specific problem with my PC and I didn't find any help about it anywhere I looked. I'll try to describe it the best I can, please note that English is not my mother tongue.

My PC shuts down unexpectedly after a manual restart. In my case "unexpectedly" means it seems like someone pulled the plugged, there's no warning at all, there's a small noise, like a "tic". And "after a manual restart" means that the system can run for weeks without any problems if I leave it on. I can use it for heavy tasks without problems. However, if I have to restart for whatever reason, after the restart, it will shut down unexpectedly after about 30 minutes. I am able to restart it again straight away without waiting but it will shut down again after 30 minutes. Until, at some point, it decides to stay up...until the next restart...

Everywhere I looked I found that the possible cause was either a faulty PSU or an overheating problem. I changed the PSU, I installed a surge protection, I changed the thermal paste, I installed a laptop cooler. The problem remains.

Have you ever heard of a problem like this ?

Thank you for reading/helping

Sam
--
System:
All-in-one Lenovo IdeaCentre A720 (with external PSU) - Windows 8.1
http://www.pcpro.co.uk/reviews/desktops/380737/lenovo-ideacentre-a720

Surge protection:
http://www.amazon.fr/APC-Onduleur-Line-400VA-240Watts/dp/B000FM7D08