Your first clue that the specs he posted are sheer BS was the "+12V: 2.0A " rating... 2.0A? Really?
That's why google is your friend. His supply doesn't have a -5Vdc output.
1) he posted the specs, didn't feel like trying to find a no brand PSU through googling, sometimes doesn't work out so well
2) I figures the either the 2A 12V was a typo or the 5V 4A (thinking it would be 40A), as with a -5V rail that could be possible