Check the voltage selector switch on the rear of the power supply. You may find it's set to the 220 or 240 volt position. Several times I've found the switch in the wrong position and had the same symptoms (and replaced the supply again, figuring it was defective).
Of course, if you're in an area where you have 220-volt service, this won't apply. If this is the case, or you've already checked the switch and it's set correctly, just check over your connections and make sure the power plug is firmly seated on the motherboard. If all else looks good, you may indeed have a dud replacement supply.
I have to ask: why did you replace the supply? Was it just for added capacity, or were you trying to solve another problem with the computer? The trouble you're describing can also be caused by a bad motherboard, and that may have been the trouble all along.
Good luck, and thanks for using Fixya!
In case the fan is ok then smps is ok the culprit is ram remove and clean instal it again and check.
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