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Memory Detection Issues with Dell XPS 435MT

I have a Dell XPS 435MT machine.(Intel Core i7 920 2.67 GHz)

I had upgraded the RAM to 24GB using the information in the following thread:

http://en.community.dell.com/support-forums/desktop/f/3514/t/19368276.aspx

It has been working fine for last 2 years or so, Recently, my PSU died and I had to replace the PSU. After PSU replacement, I notice that system is picking up only 16GB of RAM instead of 24GB. I moved the sticks around in different slots but same thing - system and BIOS only see 16GB of RAM.

Interestingly, utilities like 'System Information for Windows (SIW)' and CPU-Z show installed memory as 20GB.

Does this mean some sort of issue with the memory slots on the motherboard itself? Should I replace the motherboard?

Thanks in advance.

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