HOW TO CHECK SMPS WORK OR NOT

I have desktop I want to know my my SMPS working or  not, Because I check the connection but UPS not get power?

Its very simple so follow my steps.

Step 1: Plug in switch box and power on.

Step 2: Open the CPU cover and remove the cable form ups 

              except fan(while this process kindly switch off 

              and work).

Step  3: Take junk pin  and plug in ups cable (GREEN HOLE 

               AND BLACK HOLE).  

JUNK PIN

SMPS CABEL

Step 4: Now switch on the fan will work so the smps is 

             working If not working the fan means the smps is not 

             work.

Step 5: Its small trick off check of power checking.