This is a long shot based on your desc, but still worth doing if you haven't done it. One thing you should do just to be sure since you haven't indicated anything saying video specifically is fully test your ram. Sometimes only a thorough advanced test will show errors. Memt86 should be ran on the complete advanced options. It takes a long time to run. Let it run overnight. If it doesn't pass you can end up w/ intermittent issues. It can be slight timing or voltage(I mean slight)that can cause this. Regardless you should always test your ram thoroughly.

No need to think outside the box....
    Just make it invisible.