![]() ![]() ![]() Light grey display: Now the Mac flicks on its display and looks for the "Boot.efi" boot loader.processor, RAM, LAN + WLAN, Firewire, USB). If you see a slowly pulsing LED or hear beeps every five seconds, you have a RAM problem. If everything is okay, the startup chime is heard. Power on - startup chime: During the Power-On Self Test the hardware on yor Macs motherboard is tested (i.e.
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