The other problem could be that your MOBO may have crapped out on ya too, take out your powersupply and take it to your local comp store and they have a tester they can plug into it that will create a load on it, like testing a car battery, they will probably charge you a bench fee or test fee but most places will allow you to put that towards the purchase. Then you will know for sure if it is the PSU or not. Take out you CMOS battery for 10 secs. and replace it also remove your RAM and try to start without see what happens. Could be a lot of things, start with the cheapest and easiest fixes and test methods first I always say. IMO.
