Files recover

Hi! So a couple of months ago I accidentally pulled on the power cable of the PC Tower and ever since I've been hearing this crackling noise coming from the PSU. I've already had a problem about the computer not staying on for more than 15 mins at most before this happened. Now, I'm just...

today i've notice a very transparent tiny gray dot on my led screen, i thought it was stuck dust, tried to remove it but it won't come off, other dusty spots around it came off though. i don't know if its a dead pixel or just a sticky dust?, it doesn't look like a dead pixel for what i know...