I took my computer apart to clean the dust out, but after I put it back together it started up and I went to a youtube video and about 2 minutes into the video my pc completely turned off and I don't know why. So I took it back apart and went into the power box(I took the PSU apart)and the amount of dust inside was horrifying. So I finished cleaning that and put it back together and tried to power it back on and it was booting up and then just shut off again like 10s into the boot and when it shuts off the light on the back of the computer(turns green when you plug the power cable in)turns off, so I really dont know what could be going wrong. I also cleaned my cpu.