Does the machine turn off? What happens exactly? As of now, I am not really sure, and I am not sure if I will be of much help, but I would need to know more before I can gave any kind of answer.
Also, what is your PSU and motherboard?
Some times the screen goes black, and I will get a message that says my video has gone unresponsive, then screen comes back. Sometimes i get the blue screen.
My PSU is a Delta 300w. I cant find what my board is, it came stock with my asus Essentio cm5675