Originally Posted by
MutantJohn
I've also heard that you can clean a computer with alcohol as well. It's a good choice because it also evaporates incredibly quickly.
That being said, it sucks your computers won't work.
For the first, it might just be your PSU or mobo and for the second one, I also second what Mario suggested.
When I built my computer, I had my PSU installed upside so the fan was blowing directly into my GPU and I think it made my computer not really work. It'd turn on but not do anything so I took it to Geek Squad and they pointed out that my PSU was upside down. I flipped it and lo and behold my machine works. Even to this day.