Oh man! I forgot to say WELCOME TO Tech-Forums!
Well let's see; at times, many components suck a lot of power, so some places in your computer might not be having the correct amount of power to start working. If you're planning to try another PSU, you could try connecting it to the optical drive. Some people would suggest you doing the paper-clip test, but I don't really know what that is. For now, try getting another PSU and connecting it to the optical drive. Hopefully some of TF members will be able to assist you through this process.