Check how many pins the cable that goes from the psu to the mobo has. (the big one) If it's 20 or 24 pins then u are fine, if it's something else then most likely u are screwed.
If it's 20 or 24 any psu that u buy should work, because as far as I know all of the modern ones use either a 20 or a 24 pin cable, and u can get converters (if the mobo has 20 pin and the psu has 24 u can make the psu's 24 into 20 with a converter)
If ur psu is standard size then any other standard size psu will fit there.
And the new psu will not harm ur computer in any way. Unless sony has put some bomb in there which explodes when u change a piece of hardware