My screen also flickers to black. I use Firestorm to play. I know there is a new Firestorm release that just came out, but my computer was doing this before the new release. Here are my computer and game specs.
Firestorm 4.7.7 (48706) Mar 4 2016 22:26:47 (Firestorm-Release) with OpenSimulator support
Release Notes
CPU: Intel® Atom CPU Z3735F @ 1.33GHz (1333.34 MHz)
Memory: 1954 MB
OS Version: Microsoft Windows 8.1 32-bit (Build 9600)
Graphics Card Vendor: Intel
Graphics Card: Intel® HD Graphics
Windows Graphics Driver Version: 10.18.0010.3577
OpenGL Version: 4.0.0 - Build 10.18.10.3