[librarianonloan]

MSI Z390-A Pro ATX M/B

Intel i5 9400F CPU

ASUS Radeon RX570 4GB ROG STRIX GPU

Rosewill 750W 80+ Gold P/S

WIN10 Pro

My son assembled & has been running daily for ~16 months.

 

PROBLEM :  computer will not turn on.

 

 -- on/off button on case has no effect.

 -- shorted switch contacts on M/B - no effect.

 -- took switch from old machine & connected to contacts on M/B - no effect.

 -- LED on GPU is on ( so P/S is running ).

 -- no other activity ( fans, etc. ).

 

 Please Help. Thank you.

[Advertisements]

As a PSU puts out various voltages +3.3V, +5V and +12V it may appear that the PSU is working correctly but it is not, any significant drop of any output can prevent the system from booting up, the other scenario is a significant increase in the output which can be worse as it can fry one or more major components such as the MB, CPU, RAM, add on video card etc.

 

Take a look at the example video here which shows you how to check that a PSU is capable of powering up, no need to attach a case fan.

[phillpower2]

As a PSU puts out various voltages +3.3V, +5V and +12V it may appear that the PSU is working correctly but it is not, any significant drop of any output can prevent the system from booting up, the other scenario is a significant increase in the output which can be worse as it can fry one or more major components such as the MB, CPU, RAM, add on video card etc.

 

Take a look at the example video here which shows you how to check that a PSU is capable of powering up, no need to attach a case fan.

[librarianonloan]

Best Answer

Thanks phillpower2 :

I tested the PSU 24-pin outputs -- all measured at the correct voltages.

Sending the M/B back to MSI on warranty.

[phillpower2]

You are welcome librarianonloan