원문 게시자: originalmachead ,
'''The fans kick into high '''by default when a temp sensor fails to keep from cooking the CPU or other components like a GPU. You have damaged RAM, and possibly other problems. • 2 Flashes: No RAM is installed or detected (could be bad RAM). • 3 Flashes: Incompatible RAM types are installed. • 4 Flashes: No RAM banks passed memory testing. • 5 Flashes: No good boot images are detected in the boot ROM (and/or there is a bad sys config block). • 6 Flashes: The processor is not usable. Replacing the PRAM battery is good idea - the battery is recharged when the computer is plugged in, but the life of a battery is at most 5 years. PRAM Information includes: * Speaker volume * Screen resolution * Startup disk selection * Recent kernel panic information, if any If you experience issues related to these functions, you may need to reset the NVRAM or PRAM. ''Resetting the SMC or PRAM is not a "fix" it should only be done as part of a troubleshooting process.'' ''If this answer is acceptable '''please remember to return and mark it'''.''