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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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2009 iMac 27" A1312 EMC 2374 powers on with chime but no display

I have a 2009 27" iMac which powers on to a black screen.

Without the graphics card plugged in (no screen attached) iMac does the following:
Powers on
Chimes
Hard drive boot sound
Optical drive noise
Diagnostic led's 1&2 are lit
Fans start spinning

With graphics card plugged in(no screen attached) it does the following:
Powers on
No chime
Hard drive makes a short noise
Optical drive noise
Only diagnostic led 1 is on
Fans start spinning

With graphics card plugged in(screen attached) it does the following:
Powers on
No chime
Hard drive makes a short noise
Optical drive noise
Only diagnostic led 1 is on
Fans start spinning
Black screen
No indication of desktop when I place a flashlight close to the screen
Connected external monitor ..no display

I have tried two graphics cards ATI Radeon HD 4670 and AMD Radeon HD 4850 but no display.
Performed an oven bake on both GPU 's at 200 Celsius for 8 minutes. Tried again with no luck.

Could anyone with further knowledge kindly assist me.

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Thank you for the reply and information. Both GPU boards I believe are original for the 2009 27" iMac at least the 4670 GPU. I purchased the iMac and the previous owner told me that he had ordered a repacement GPU but he had no luck.

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Well you nailed the issue it’s the MXM graphics boards. But the board you are using needs to be for the Apple systems as of course Apple had to tweak there’s!

Sadly these are hard to find and some Amazon/eBay jobbers will sell you others and dead boards so you just can’t count on them as being good.

Find an Apple parts house as there focus is to help and they won’t stay in business long with poor quality parts.

Here’s one source 2009 27” iMac GPU boards

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Thank you for the reply and information. Both GPU boards I have are I believe original for the iMac at least the 4670 GPU. I purchased the iMac and the previous owner told me that he had ordered a repacement GPU but he had no luck.

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jnicus zal eeuwig dankbaar zijn.
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