So, your computer shuts down "in an instant from 1-30mins of used", both before you changed the PSU and after, right? In other words, changing PSU made no difference, right?
I don't know what the problem is but I do know you have a very cheap PSU - assuming my currency conversion is correct - there and cheap is not good when we're talking about a PSU.
Is the currency on that website Philippines Pesos? If so, 650 Philippines Pesos is about equal to $13.50. So, it's a very cheap PSU. I can't imagine buying a PSU for that price. To begin with, I can't imagine finding any new one at that price.
Are you located in the Phillipines? Do you have plenty of sources of better quality PSU's there?