Mine started acting funny (Base model D300's) and i took it in. Seems that the IO board may need to be replaced or the GPU's, they are still testing. Luckily i still have a month of applecare left. I am a little horrified, the machine is less than a year old - wondering what is coming down the line. I read some forums, seems the first batch has some bad vram - You guys been having any problems?