my new iMac came today, and i boot it up, looking and working great. i let it run through the updates, and i come back shortly after and its at a grey screen with the loading icon. it does this for some time, so i leave it come back in about 45 minutes and its still doing this, so i manually restart. upon restart i get an error: panic(cpu 0 caller 0x003a934f): Unable to find driver for thiss platform: "ACPI". Debugger called: <panic> and so on... the message in the center of the screen sais, " you need to restart your computer. Hold down the power button for sever... after resatrting numerous times and getting the same message, i reeinstall tiger thinkin a fresh install will fix it, but after doing so i get the same error, also the hardware test shows no issues. does anyone have a clue what the issue is?