external monitor malfunction

Hi everybody

I have a problem with any external monitor when I use the external mini display port of my macbook pro (I use OS X snow leopard 10.6.8, processor 2.53 GHz Intel Core i5, 4 GB RAM). When I use the original MAC adapter to VGA the displays are visible in both monitors but after a while they go away in both monitors and they become blank and after few seconds everything goes back to normality. This is quite annoying especially when doing presentations since it happens almost once per minute. When I bought the computer in 2010 it worked fine. Any idea? Should I send it for repair?

Best regards


antonio

 

No fix?