Hey guys, today when i was using my computer i got a grey screen filling my screen up saying that i need to push the power button to restart my computer. When i restarted it i read some stuff online saying that this is caused by malfunctioning hardware, well i performed a hardware check. The extended one, and it came up fine. Whats wrong with my computer? It's a iMac i5 3.1 Ghz with 4Gb of ram, little over a month old. Should i be worried? Thanks.