Well that power supply is not especially good but I'd like to think it would support your system.
I would try looking at this thread starting at step 22. Since it did work for 2 weeks, unless you have changed something inside the computer recently, you should be able to skip the first part of the guide talking about connecting all the right components to the right places and making sure they have power. Step 22 outlines disconnecting everything except the cpu and heatsink and booting. you should hear some beeps. If you don't, take the mobo back out of the case and breadboard as suggested in the guide. If you get a series of beeps, continue adding components as the guide detpails to diagnose your problem.http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems