I recently started having a problem with my psu, it constantly makes a weird hissing noise whenever i start up my computer, and it doesn't seem to go away even when i lightly tap on the psu in hopes the noise will stop. It all started when i decided to put on a new layer of thermal paste since my cpu seems to be heating up whenever i play games. Afterwards, my gpu (geforce gtx 550ti) didn't seem to get any signal for my monitor so i tried to push it in thinking it was because it was loose, after everything started to work i placed the computer onto my stand but i accidentally switched the on/off button on the psu (while the computer was still on and everything) Thinking it probably wasn't such a big deal i opened my computer again and it says on the screen something about a surge has occured and the system will shut down. When i tried opening my computer again that is when the noise started and my monitor isn't receiving any signal from my gpu at all. What happened? and what do i do to fix it? do i need a need psu or something?