I've looked all over the internet but I've had no luck in finding out how to properly display my Macbook Pro on an external device. I've tried an Epson projector and a Sony TV and have had no success with either; I've plugged in other Macs into those devices and using the same cables and they work, so it is definitely on my Mac's end. Using a VGA adapter and Thunderbolt port. OSX 10.9.3. My Mac detects the external devices but nothing shows up on the actual displays. I've tried Mirroring options and still nothing. Any ideas would be really helpful (and sorry I know I'm not the most computer literate person).
2.5 GHz Intel Core processor, 4 GB Memory 1600 MHZ DDR3