Q: MacBook Air can't connect to external display

2 months ago I bought a Thunderbolt to VGA adapter and its working normally, then after 2 weeks its stopped working. I plugged the adapter in and the VGA cable then the built-in display fades to black (nothing is happening on my external display at all) and it fades back to normal, so it knows that I'm connecting something. I've tried this with all my TVs in the house, no luck. And the screen always does that when I'm trying to connect it and disconnect it.

So today I bought an HDMI and a Thunderbolt to HDMI adapter, it doesn't work, it acts the same!

It fades to black when I connect the HDMI cable, then it fades back to normal! even when I disconnect the cable

I tried resetting SMC & NVRAM/PRAM, the mac is on, it isn't sleeping, i already tried pressing Detect displays in the Displays settings and it doesn't fix anything.

Running on OSX Yesomite 10.10.2

MacBook Air (13-inch, Early 2014 , 1440 x 900)

1.4 GHz Intel Core i5

4 GB 1600 MHz DDR3

Intel HD Graphics 5000 1536 MB