POWER SUPPLY PROBLEM. I HAVE REPLACE THE SMPS MODEL NO. ST400EAD-05F BY ST600EAD-05G OF SEVENTEAM

Question

I HAVE REPLACE THE SMPS MODEL NO. ST400EAD-05F BY ST600EAD-05G OF SEVENTEAM ELEC.TAIWAN, DUE TO UNAVAILABILITY OF SMPS. SMPS TURNED OFF JUST AFTER START. THEN WE REMOVE THE CPU POWER SUPPLY (8 PIN) AND THEN START THE SMPS, THEN POWER SUPPLY IS STAND. SO IS THE PROBLEM IS IN SMPS OR IN MOTHER BOARB OR IN PROCESSOR.PLEASE SUGGEST YOUR VALUABLE ADVISE. THANKING YOU.M.BISWAS,[e-mail]