Laptop shuts down after 3 seconds

[ahuka]

My laptop shuts down immediately after like 3 secs, leds work, fan not working even replaced fan but results still the same

Laptops about 5 years

 

[Tolis_GR]

Try reseating your ram modules and hard drive.

 

[ahuka]

Still not working

 

[Tolis_GR]

If your new cpu fan is still not working then the problem is within the connection to the mobo. I suspect it forbids powering up as a protective measure due to the problem in your cpu cooling. You should check whether there is voltage coming to the fan connector or not