hello, i have a problem that everytime i restart my imac (late 2007) i get the blinking folder for 15 minutes up to a couple of hours then it starts up normally. i tried clearing up the PRAM. reset the SMC. and it still happens. i tried to do from the system a repair disc permissions and i got back one error that cannot be fixed which was <quote> Warning:SUID file"System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents?MacOS/ARDAgent" has been modified and will not be repaired.</quote> i have even tried to fix the error from the bootable CD, but same error. i even upgraded to snow leopard but no apparent change. i dont even know if this is the cause of the problem. but all other stuff is OK. even the boot CD hardware thorough check was all ok. i still get some noise of the fan when i boot up for a couple of minutes then it goes away.but temperatures are quite good and fan speed is around 800rpm at the moment and no sound is to be heard.