PC screen goes blank(or purple) but PC lights stay on

i having almost the exact same problem as this guy http://www.tomshardware.com/forum/292623-33-screen-blank-blue-light-stays-more

This has just begun recently and on two computer games so far. At random times my computer screen goes black. Everything in the PC tower goes silent, no fans, no sounds fx from game, no nothing, but the blue light of my PC stays on. Some times in game the screen turns like solid blue or purple in little pixelated chunks.

Its not over heating my GPU temp never goes over 60c on full load.

It's a newish comp

my specs

Windows: windows 7 64bit
Processor: i5-750
Memory: 4GB
Graphics Card: NVIDIA GeForce GTS 250
PSU-700 watts
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More about screen blank purple lights stay
  1. Already installed the proper driver?
    Also try running with just 1 stick of RAM, see whether you still get Black Screen or not...
    What is your motherboard? Has an onboard graphic?
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