Hynix 512 and transcend 1GB I don think its a ram problem either mate. I m pretty sure its monitor thats acting up and the timing was pure coincidence !
hmm, it occurs occasionally.. 3 to 4 times per day.. When I restrart from shutdown/sleep, problem gets solved.
Haven't checked the brand of my RAM but its came with HP pc so must be some good company RAM and it is quite good while playing games than my previous PC.