LG IPS 24" LED monitor & MacBook Pro lock-up with grey screens
I am connecting a new LG IPS 24" LED monitor (24MP60VQ) to my 2010 13'' MacBook Pro running OSX 10.11.6 via the MiniDisplay port using the Apple supplied MiniDisplay/VGA adapter and a generic VGA cable. After 20 minutes work (+/-) both displays lose image and go solid grey and the MacBook freezes. Most used software is Photoshop, Smithmicro Poser 10 and Microsoft Word. Any suggestions as to possible source of this problem and cure?