try this right click on dota 2 select Properties and Set Launch Options, then enter the following:
-windowed -w 1920 -h 1080 -noborder -novid
replaced 1920x1080 with your actual resolutions
Dota 2 - Blank screen, cant/often blank screen when alt tab
Feb 17 2013, 07:26 PM
Quote
0.0134sec
0.49
6 queries
GZIP Disabled