Hello. I have been using my MBP (2010, i7 17" model) with a 24" HP external HDMI LCD monitor. The connection is via the Apple's Mini DisplayPort to VGA Adapter. It was working perfectly the first day I tried. However, when I connected the external monitor to the MBP yesterday, I found that the LCD screen of the external monitor was blinking. It lasted for about 5 minutes and then the problem was gone by itself. I have just reconnected my MBP to the monitor again. The problem reappears. Anybody knows what is going on and how to fix it? Thanks.