Mac mini not booting up with 8GB memory after 10.7.2 update

My mac mini is not booting up with 8GB of memory after the 10.7.2 update. It just keeps on beeping and flashing the led.
If I take out the upper DIMM (Bank 1) It boots just fine, and it does so with either one of the 4GB DIMMs in Bank 0, so the DIMMs are fine. It also boots up fine with two 1GB DIMMs installed simultaneously, so the Bank 1 seems to be somehow working as well.
This trouble started right after the Lion recovery update, meaning the mini has never booted with the full 8GB installed after the update.
It worked just fine before that, with the full 8GB of memory installed.
Anyone else having similar problems?
Cheers, Otto.

I have upgraded my 2011 Macbook Pro and my 2011 Mini Server
to 8 gig with Corsair RAM and have had no issues
(CMSA8GX3M2A1333C9). What brand RAM was used?
There have been issues in the past with some RAM
brands.
Something to try is a PRAM reset with the 8 gig installed.
http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html
Also, make sure the Minis are booting into 64 bit mode.
Open Applications->Utilities->System Information
On the left side click the software heading. There should be a line
64-bit Kernel and Extensions: Yes
This should be the default for 2010 and 2011, but something could
have got hosed.

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