I have a mac mini, bought it around July 2005. Great machine! The other day I got a message that I have never seen before. "Please shutdown the computer using the power button" or something like that. It was displayed in 3 other langauges! I have never seen such an error as this! I was speaking with a friend who uses Mac's reguarly. He explained that this is a serious error. He asked if I have made any kind of upgrades to my Mini. I told him that I installed a DIMM of 1 gig in size. This was done maybe 1.5 years ago? I have never had a problem with this machine! He said I need to call applecare immediately. The machine has been running just fine today. Could anyone offer some advice? Thanks.