My Pc shut down a few times on me one day so i decided to clean out my fans. I did not unplug anything so but i did make sure i did not knock out any wires. I did not use liquid products Then when i tried to turn on my pc i would not turn on but i did notice a small high pitched noise coming from my power supply and a little bit of a burning smell So i quickly unpluged the power and turned the power supply switch off. After a few tests i believed my power supply died so i bought a new power supply with somewhat better watts than mine and should easily handle my specs. The same thing is happening with this new power supply and i got the person at the store to test it before selling it to me. What are your ideas on what it could be?