iMac 20" A1224 dark screen with 9 beeps
I have gone through the previous messages about this issue:
3 short + 3 longer + 3 short beeps means EFI ROM checksum failed. I downloaded and created Firmware restoration CD 1.6 for iMac7,1 from Apple support.
Turned power on and iMac sucked in the CD and ejected after 1 minute and started beeping cycles again.
- I burned the CD on Windows with PowerISO. Should I try burn the CD on Mac instead?
- It seem doing something with the CD. Or it's hardware issues with the ROM or board that firmware refresh won't fix?
Any feedback welcome. Thanks.
ps. I remove the screen and couldn’t see any bad connection and also replaced the lithium battery too.