Is it possible to burn a PSU

So i could not power up my PC so i tryed to see if the power supply was the problem so i turned on the PSU with the motherboard RAM and graphics card. It worked then i knew the frontpanle connecters were the problem so i tryed that turned the PSU on and of and disconected it it still did not work so then when i whent back to see if the PSU was the problem by only connecting it to the motherboard ram and graphics card it did not turn anything on i am sad because i was hopeing to play battlefield 3 tomorrow can i please get helpĀ 

Make sure you connect your 24 pin your 4-8 pin for the cpu and the power button pins to the mobo.