I'm having a problem with my desktop pc... it hasn't been turning on for a few months. whenever i press the power button the the front, the light turns on for a second and i can hear the computer trying to start up, then it dies. a friend told me the problem is my power supply, so i opened up my computer and took out the power supply box. it looks like there's burn marks in it, and some components are melted. i took the information off of it, and went to a computer store to get a new power supply. now that i've hooked all the connections in and am trying to start my computer, it won't even turn on or do anything! any suggestions?