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Why would the BIOS return a memory error on a random DIMM slot?

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robo_dev

if you've basically swapped memory and system board, then something else is wrong.

Did the Tech swap the processor?

The other variable is the power supply.

Maybe a wild guess, but I know that Dell uses what are called 'active PFC' power supplies on some models. These PSUs do not play well with a UPS, for example...you need a 'real' true-sine-wave UPS to run one of these units. While some new technology is really great, these new power supplies can die a horrible death if they are fed a pseudo-sinusoidal input power signal (the stepped approximation of a sine wave provided by many normal UPS units).