EFI Firmware possibly corrupted?
Hope someone like Mayer :) has an answer for this one.
I've got a 13" 2008 Unibody Macbook, 2.4GHz. At startup, it behaves as if it's performing a firmware update: Press power button, SIL comes on, blinks rapidly about 10 times, then I get one long beep (about 2 seconds). The SIL stays on, then about 25 seconds later, I hear the chime and the Macbook boots up normally.
Everything works: WiFi works, fan is running, all RAM is recognized, etc. A restart or shutdown will take us back to square one again. I've checked the machine overview, and the Macbook is reporting the correct EFI Boot ROM and SMC versions for this model (Macbook5,1).
The RAM is known to be good RAM (pulled from another 2008 Macbook on my workbench) and is the correct speed for this Macbook (1066MHz, PC3-8500, Apple Branded RAM).
Is there a way to force the Macbook to flash the firmware again, in the event this firmware is somehow corrupt?
If so, which Firmware Restoration CD version do I download? None of the CD versions on the Apple website (1.3 to 2.0) list this particular Macbook.
Is this a good question?