Mini Display to VGA adapter stopped. The Mini Display to HDMI is still working fine. How´s that possible?

The mini display to VGA adapter had stopped, whinle the Mini Display to HDMI keeps working fine. The minid display to VGA adapter was replaced and the VGA cable as well, and the problem is the same. This test was made with two diferent monitors with VGA entries. How´s that possible to happen? Is that a configuration trouble in the MBP?

The Apple´s customer support gave us the solution for this problem:
SMC reset
PRAM reset
The VGA adapter return to work properly aflter this procedure.

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