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Imac won't boot with faster ram modules

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Jul 23, 2012
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Motherboard
Asus Prime X570 Pro
CPU
Ryzen 9 3900X
Graphics
RX 590
Mac
  1. iMac
  2. MacBook Air
  3. MacBook Pro
Mobile Phone
  1. Android
  2. iOS
Hi
I have a 21.5" imac10,1 (late 2009) running with 2x2GB of 1066MHz DDR3. In order to use these 2GB modules elsewhere, I tried to replace them with 4x1GB of 1333MHz DDR3 (retrieved from old Mac minis) but the imac won't boot. I get a repetitive beep and no display.

I knew the ram couldn't run faster than 1066 but I would have expected that the imac would boot properly.

I'm surprised these 1333MHz modules cannot run at a lower speed....

Any thoughts?

Best,
-a-

PS. I tried alt+cmd+p+r but nothing happened
 
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