No Disply but Diagnostic Led 3 & 4

Question

iMac Intel 27" EMC 2309 & 2374

iMac Intel 27" EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz) ID iMac10,1, EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz) ID iMac11,1

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Ana @ana90046

Rep: 1

Postato: 14 giu 2014

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No Disply but Diagnostic Led 3 & 4

Please assist.

iMac suddenly do not display after trying to install firmware update(vid was flickering). Initially suspect video card, after tear down, both LED 3 & 4 are the only ones ON even though Mac turns on (Fan included) and you can hear the chime.

Any input on whats possibly the issue? Logic board?

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originalmachead @originalmachead Rep: 116,3k 66 68 359 · Answer 1 · 2014-06-14T07:11:47-07:00

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originalmachead @originalmachead

Rep: 116,3k

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68

359

Postato: 14 giu 2014

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Try connecting to an external monitor. You may see an image there. Can you provide a link to the EFI update you used (or at least state the version), and a reason why you felt you needed to install it?
LED #3 is normally "on" when all is well.... LED #4 indicates an overtenp problem (but due to the EFI screw up that might be a false reading).

# Try booting to your AHT diagnostic disk or partition.

Try a safe (shift) boot.

If this answer is acceptable please remember to return and mark it.

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