You said its 230 VOLTS?? You're looking for the WATTAGE to get the power output, the voltage is fixed for your region.
The last time you were using it, did u hear a pop or smell something burning?? i have blown up several
PSU's, not in a computer, but by using them to do random things, and when one dies, there will normally be a small pop or fizzle, accompanied by the smell of burning electronics.
There are ways to test
PSU's, but i am not the best person to instruct you on how to do so, you would probably be better off googling the subject